zephyr: drivers: add TCPCI CC related tests
zephyr: drivers: add TCPCI CC related tests

This patch adds unit tests for following driver/tcpm/tcpci.c functions:
- tcpci_tcpm_get_cc()
- tcpci_tcpm_set_cc()
- tcpci_tcpm_set_polarity()
- tcpci_tcpm_set_vconn()

BUG=b:184857030
BRANCH=none
TEST=make configure --test zephyr/test/drivers

Signed-off-by: Tomasz Michalec <a547db31280d14f095c760a23a7523d0b1e55fe6@semihalf.com>
Change-Id: I91208fa5093677db612358c804f29fb8b359b820
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3220336
Reviewed-by: Denis Brockus <6b21e8190fb5e373363fb95271367073a16474ef@chromium.org>
Tested-by: Tomasz Michalec <c064a6042954d4ba0805003dc021b76413ff1548@google.com>
Commit-Queue: Tomasz Michalec <c064a6042954d4ba0805003dc021b76413ff1548@google.com>

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