google/reef: Update chromeos.fmd file

1. Mark 256KiB at end of BIOS region as unusable BIOS region is
memory-mapped just below 4GiB, however last 256KiB is unusable. Mark it
accordingly in fmd file.
2. Use up holes in RW region for RW_A and RW_B.
3. Fill up holes in RO with UNUSED regions.

BUG=chrome-os-partner:54672

Change-Id: I5facc566bb70d950522e12228b0631ddf00ac63d
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/15313
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
1 file changed