cbi: Add support for CONFIG_WP_ACTIVE_HIGH
cbi: Add support for CONFIG_WP_ACTIVE_HIGH

The CBI module was missing support for an inverted write protect signal,
this commit simply adds that support.

BUG=b:146172102
BRANCH=None
TEST=`make -j buildall`

Change-Id: Ic52853e67a9f650609c09d719e57ed34f18d7f02
Signed-off-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1986312
Tested-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Auto-Submit: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Reviewed-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>
Commit-Queue: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec