Only use the custom hash routine when we need little endian.
Rename the function as well as it is little endian only now.
BUG=N/A
TEST=tested on fbg1701 board.
Change-Id: I037fa38c5961dab7a81e752c1685da2dc6b33d12
Signed-off-by: Wim Vervoorn <wvervoorn@eltan.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36482
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Frans Hendriks <fhendriks@eltan.com>