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>
