boot: add Provides:systemd-boot(isa)

As requested in https://github.com/rhinstaller/anaconda/pull/4368#discussion_r1043839809,
so that it's easier to depend on the appropriate package. Once we have the
signed version built, this provides might be dropped. But let's add it at least
for now so that there's a stable name to depend on.

While at it, let's drop ? from %{_isa}. Systemd is always archful.

systemd.spec

@@ -191,7 +191,7 @@ Requires:       %{name}-libs = %{version}-%{release}
 %{?fedora:Recommends:     %{name}-resolved = %{version}-%{release}}
 Recommends:     diffutils
 Requires:       (util-linux-core or util-linux)
-Recommends:     libxkbcommon%{?_isa}
+Recommends:     libxkbcommon%{_isa}
 Provides:       /bin/systemctl
 Provides:       /sbin/shutdown
 Provides:       syslog
@@ -284,7 +284,7 @@ for information how to use those macros.
 %package devel
 Summary:        Development headers for systemd
 License:        LGPLv2+ and MIT
-Requires:       %{name}-libs%{?_isa} = %{version}-%{release}
+Requires:       %{name}-libs%{_isa} = %{version}-%{release}
 Requires(meta): (%{name}-rpm-macros = %{version}-%{release} if rpm-build)
 Provides:       libudev-devel = %{version}
 Provides:       libudev-devel%{_isa} = %{version}
@@ -298,7 +298,7 @@ to libudev or libsystemd.
 Summary: Rule-based device node and kernel event manager
 License:        LGPLv2+
 
-Requires:       systemd%{?_isa} = %{version}-%{release}
+Requires:       systemd%{_isa} = %{version}-%{release}
 Requires(post):   systemd
 Requires(preun):  systemd
 Requires(postun): systemd
@@ -354,6 +354,8 @@ machine, and to create or grow partitions and make file systems automatically.
 Summary: UEFI boot manager (unsigned version)
 
 Provides: systemd-boot-unsigned-%{efi_arch} = %version-%release
+Provides: systemd-boot = %version-%release
+Provides: systemd-boot%{_isa} = %version-%release
 
 # self-obsoletes to install both packages after split of systemd-boot
 Obsoletes:      systemd-udev < 252.2^
@@ -370,7 +372,7 @@ the version that works with Secure Boot.
 %package container
 # Name is the same as in Debian
 Summary: Tools for containers and VMs
-Requires:       %{name}%{?_isa} = %{version}-%{release}
+Requires:       %{name}%{_isa} = %{version}-%{release}
 Requires(post):   systemd
 Requires(preun):  systemd
 Requires(postun): systemd
@@ -389,7 +391,7 @@ systemd-importd.
 %package journal-remote
 # Name is the same as in Debian
 Summary:        Tools to send journal events over the network
-Requires:       %{name}%{?_isa} = %{version}-%{release}
+Requires:       %{name}%{_isa} = %{version}-%{release}
 License:        LGPLv2+
 Requires:       firewalld-filesystem
 Provides:       %{name}-journal-gateway = %{version}-%{release}
@@ -407,7 +409,7 @@ systemd-journal-upload.
 
 %package networkd
 Summary:        System daemon that manages network configurations
-Requires:       %{name}%{?_isa} = %{version}-%{release}
+Requires:       %{name}%{_isa} = %{version}-%{release}
 License:        LGPLv2+
 # https://src.fedoraproject.org/rpms/systemd/pull-request/34
 Obsoletes:      systemd < 246.6-2
@@ -419,7 +421,7 @@ devices.
 
 %package resolved
 Summary:        Network Name Resolution manager
-Requires:       %{name}%{?_isa} = %{version}-%{release}
+Requires:       %{name}%{_isa} = %{version}-%{release}
 Obsoletes:      %{name} < 249~~
 Requires:       libidn2.so.0%{?elf_suffix}
 Requires:       libidn2.so.0(IDN2_0.0.0)%{?elf_bits}
@@ -442,7 +444,7 @@ a userspace out-of-memory (OOM) killer.
 
 %package tests
 Summary:       Internal unit tests for systemd
-Requires:      %{name}%{?_isa} = %{version}-%{release}
+Requires:      %{name}%{_isa} = %{version}-%{release}
 License:       LGPLv2+
 
 %description tests