brask: Config-guard TBT UFP code
brask: Config-guard TBT UFP code

Only build Thunderbolt UFP config for boards that support Thunderbolt.
Reduce code size and avoid linker errors.

BUG=b:244467636
TEST=make buildall
BRANCH=none

Signed-off-by: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@chromium.org>
Change-Id: Ia6bf6785cc2def57cbcd65eeb25565a15a5c1484
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3887966
Reviewed-by: Zhuohao Lee <916bf7ddbf0565669e59e3cb2b613381a48066c0@chromium.org>

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