limozeen: Refine the BRD_ID check
limozeen: Refine the BRD_ID check

Limozeen's BRD_ID is not monotonically increasing.
The earliest revision is 4. The next BRD_ID after 7 is 0.
Not support PPC workaround when BRD_ID 0 on limozeen.

BUG=b:190250108
BRANCH=trogdor
TEST=make buildall success.

Signed-off-by: David Huang <0bee89a4ff99f17b7e64fbf6530169dc03ff1a24@quanta.corp-partner.google.com>
Change-Id: I16d7ff081306812c14aa31ce2b19af8e2d50ff76
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2952802
Reviewed-by: Wai-Hong Tam <04b587fdf5845741a0c5a8b9cd59ca72d73ef8fc@google.com>
Commit-Queue: Wai-Hong Tam <04b587fdf5845741a0c5a8b9cd59ca72d73ef8fc@google.com>

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