zephyr: cbi: Add test for missing codepaths
zephyr: cbi: Add test for missing codepaths

BRANCH=none
BUG=b:202789410
TEST=zmake configure --test zephyr/test/drivers

Signed-off-by: Yuval Peress <50dc11c009bd4d7e9d9d15a383c1743ce5ee82ef@google.com>
Change-Id: I462f4da5bed22cf457542b7254507b724f60c1a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3290163
Commit-Queue: Wai-Hong Tam <04b587fdf5845741a0c5a8b9cd59ca72d73ef8fc@google.com>
Reviewed-by: Wai-Hong Tam <04b587fdf5845741a0c5a8b9cd59ca72d73ef8fc@google.com>

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