remove upstreamed patch

skiboot-6.6.2-ffspart.patch

@@ -1,25 +0,0 @@
-commit 6278c6df4ff2123725efc10e5e6ea48d02fda55a
-Author: Dan Horák <dan@danny.cz>
-Date:   Mon Aug 10 12:59:04 2020 +0200
-
-    external/ffspart: define $(sbindir) for Makefile
-    
-    Right now the $(sbindir) variable isn't defined, so the binary gets installed
-    directly into $(DESTDIR).
-    
-    Signed-off-by: Dan Horák <dan@danny.cz>
-
-diff --git a/external/ffspart/rules.mk b/external/ffspart/rules.mk
-index 40972c688..e006dc5b7 100644
---- a/external/ffspart/rules.mk
-+++ b/external/ffspart/rules.mk
-@@ -10,6 +10,9 @@ LIBFLASH_SRC := $(addprefix libflash/,$(LIBFLASH_FILES))
- OBJS	+= $(LIBFLASH_OBJS)
- OBJS	+= common-arch_flash.o
- 
-+prefix = /usr/local/
-+sbindir = $(prefix)/sbin
-+
- CC	= $(CROSS_COMPILE)gcc
- 
- FFSPART_VERSION ?= $(shell ./make_version.sh $(EXE))