ANDROID: usb: typec: tcpm: Add vendor hook to modify port src caps

Add a vendor hook to modify the port Source Capabilities. If the caps
are changed and the port state is feasible, start a Power Negotiation
AMS to update the current contract to the new one.

Bug: 201006190
Bug: 206108037
Bug: 271294543
Signed-off-by: Kyle Tso <kyletso@google.com>
Change-Id: I8b524242353781cb39b3ba85c6a75bd5a204ebcf
(cherry picked from commit b499bac4)