zephyr: test: Add board_version host command test case
zephyr: test: Add board_version host command test case

Add the test case which gets the board version. It returns the
default board version 0.

BRANCH=None
BUG=b:236074980
TEST=./twister -s zephyr/test/drivers/drivers.default

Change-Id: Icbd622d1435a1a852834c4b57854759c4b4f9db5
Signed-off-by: Wai-Hong Tam <04b587fdf5845741a0c5a8b9cd59ca72d73ef8fc@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3834011
Code-Coverage: Zoss <345cf107e82c70959d46f59d98bddc98ce458aff@prod.google.com>
Reviewed-by: Al Semjonovs <c3a2ecb550cad1e7d5a943ca6241377f7b43ffc4@google.com>

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