Add writeprotect support infrastructure

The following just lays out the structure for write protect
manipulation of SPI flash chips in Flashrom. We later follow
up with adding support for each manufacturer group.

BUG=b:153800563
BRANCH=none
TEST=builds

Change-Id: Id93b5a1cb2da476fa8a7dde41d7b963024117474
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/40325
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
6 files changed