TCPMv2: Add missing check for USB_PD_DEBUG_LABELS
TCPMv2: Add missing check for USB_PD_DEBUG_LABELS

There was a missing USB_PD_DEBUG_LABELS which didn't allow setting the
USB_PD_DEBUG_LEVEL to 0.

BUG=none
TEST=make with CONFIG_USB_PD_DEBUG_LEVEL 0
BRANCH=none

Signed-off-by: Eric Herrmann <12250e28c55eb76c3d4c0703db67acc60d621e70@chromium.org>
Change-Id: Ibd3676d3b53e37e852e938023edc20a5f49afd5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2283128
Reviewed-by: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@chromium.org>
Commit-Queue: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@chromium.org>

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