platform/chrome: cros_ec_typec: Displayport support

Add support for entering and exiting displayport alt-mode on systems
using AP driven alt-mode.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Link: https://lore.kernel.org/r/20241213153543.v5.6.I142fc0c09df58689b98f0cebf1c5e48b9d4fa800@changeid


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>