egrep, fgrep: deprecated

egrep, fgrep: deprecated

Since this grep commit:
	commit a9515624709865d480e3142fd959bccd1c9372d1
	Author: Paul Eggert <eggert@cs.ucla.edu>
	Date:   Sun Aug 15 10:52:13 2021 -0700

	    egrep, fgrep: now obsolete

egrep will trigger a warning like:
	+egrep: warning: egrep is obsolescent; using grep -E

This will break many gold output.

Signed-off-by: Murphy Zhou <jencce.kernel@gmail.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>