tree: Replace `egrep` with `grep -E`

For compatibility reasons, egrep is just a wrapper around grep today.
Thus, replace it with `grep -E`.

Change-Id: Ief08a22e4cd7211a3fee278492c95d37f9e058fa
Signed-off-by: Felix Singer <felix.singer@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74171
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

payloads/libpayload/curses/PDCurses/aclocal.m4

@@ -463,7 +463,7 @@ EOF
 			DYN_COMP=""
 		else
 			slash="\\"
-			mh_dyncomp="`egrep -c $slash$a conftest.tmp`"
+			mh_dyncomp="`grep -E -c $slash$a conftest.tmp`"
 			if test "$mh_dyncomp" = "0"; then
 				DYN_COMP="$a -DDYNAMIC"
 				AC_MSG_RESULT($a)

util/lint/lint-000-license-headers

@@ -81,7 +81,7 @@ fi
 
 #get initial list from git, removing HEADER_EXCLUDED files.
 #make a copy to check for the old style header later.
-headerlist=$(${FIND_FILES} $HEADER_DIRS | egrep -v "($HEADER_EXCLUDED)")
+headerlist=$(${FIND_FILES} $HEADER_DIRS | grep -E -v "($HEADER_EXCLUDED)")
 
 #update headerlist by removing files that match the license string
 check_for_license() {

util/lint/lint-001-no-global-config-in-romstage

@@ -10,7 +10,7 @@ LC_ALL=C export LC_ALL
 find src -name .svn -type d -prune -o -name mainboard -type d -prune -o -name examples -type d -prune -o -type f -exec sed -nf `dirname $0`/remccoms3.sed {} + > $SCANBUCKET
 
 for define in $DEFINES; do
-	if [ `egrep -c "([^_A-Za-z0-9]$define[^_A-Za-z0-9]|^$define[^_A-Za-z0-9]|[^_A-Za-z0-9]$define\$)" $SCANBUCKET` -gt 0 ]; then
+	if [ `grep -E -c "([^_A-Za-z0-9]$define[^_A-Za-z0-9]|^$define[^_A-Za-z0-9]|[^_A-Za-z0-9]$define\$)" $SCANBUCKET` -gt 0 ]; then
 		echo "$define is defined in mainboard(s) and used elsewhere"
 	fi
 done

util/lint/lint-stable-009-old-licenses

@@ -39,7 +39,7 @@ if [ -z "$HEADER_DIRS" ]; then
 	HEADER_DIRS="src util tests"
 fi
 
-headerlist=$(${FIND_FILES} $HEADER_DIRS | egrep -v "($HEADER_EXCLUDED)")
+headerlist=$(${FIND_FILES} $HEADER_DIRS | grep -E -v "($HEADER_EXCLUDED)")
 
 #check for the old style header
 headerlist=$(grep -il "You should have received a copy of the GNU" \

util/scripts/cross-repo-cherrypick

@@ -36,7 +36,7 @@ esac
 # lines must be backwards due to tac(1)
 SPLICE_CMD=""
 if test "$1" = "--cros"; then
-	if test -z "$( commit_message |egrep '^(BUG|TEST)=')"; then
+	if test -z "$(commit_message | grep -E '^(BUG|TEST)=')"; then
 		SPLICE_CMD='print "\nTEST=none\nBRANCH=none\nBUG=none\n"'
 	fi
 fi