tcpm_header: add more driver call-through tests
tcpm_header: add more driver call-through tests

These functions call the driver's implementation only if present.

Added tests for both cases where the driver does and does not implement
these functions.

Functions tested:
- tcpm_debug_accessory
- tcpm_debug_detach
- tcpm_hard_reset_reinit

BUG=none
TEST=twister, verify lines are now covered
BRANCH=none

Signed-off-by: Clayton Whitelaw <fbdb9be3c3e4127583ebc8145e30a4ca476b4c80@google.com>
Change-Id: I26e1cdb74f1ed3f08065a301081561a764322bc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/4048912
Code-Coverage: Zoss <345cf107e82c70959d46f59d98bddc98ce458aff@prod.google.com>
Reviewed-by: Yuval Peress <50dc11c009bd4d7e9d9d15a383c1743ce5ee82ef@google.com>

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