usbc: modified the DPM logic to match the DP module logic.
usbc: modified the DPM logic to match the DP module logic.

modified the DPM logic to match the DP module logic.

BUG=b:239515386
BRANCH=none
TEST=make buildall

Signed-off-by: amber.chen <21140f70e84af3207302c4be977fd739c3f5bcc2@lcfc.corp-partner.google.com>
Change-Id: Ie382825700fd4e7110480990c540a2f1d64de634
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3908972
Reviewed-by: Boris Mittelberg <46897f4fb5cad4b1d5146ad1fd460d7f4825bbf7@google.com>
Reviewed-by: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@chromium.org>
Reviewed-by: caveh jalali <08e24a66aefda7a55ca7d73f8903e0fb16eec763@chromium.org>
Reviewed-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>
Code-Coverage: Zoss <345cf107e82c70959d46f59d98bddc98ce458aff@prod.google.com>

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