Revert "Remove trace_buf_size and trace_event from the kernel bootparameters of the kdump kernel"

There is a mechanism to keep memory consumption minimum, i.e. equal
to trace_buf_size=1, until tracing by ftrace is actually started:

    tracing: keep ring buffer to minimum size till used
    73c5162aa3

Since ftrace is usually never used in the kdump 2nd kernel, the kdump
2nd kernel behaves in the same way with or without trace_buf_size=1.
So the issue which the patch want to solve never exists. Let's revert
the patch for better maintainance and avoid confusion.

ref link: https://bugzilla.redhat.com/show_bug.cgi?id=2034501#c20

This reverts commit f39000f.

Signed-off-by: Tao Liu <ltao@redhat.com>
Acked-by: Coiby Xu <coxu@redhat.com>

kdump-lib.sh

@@ -782,10 +782,6 @@ prepare_cmdline()
 		fi
 	done
 
-	# Remove trace_buf_size, trace_event
-	cmdline=$(remove_cmdline_param "$cmdline" trace_buf_size trace_event)
-	cmdline="${cmdline} trace_buf_size=1"
-
 	echo "$cmdline"
 }