usb: pd: Register dual_role based on connector type

Since PD is not supported with microUSB connector,
do not register dual_role_instance if connector type is
microUSB as charger driver will take care of it.

Change-Id: Ib7d145dd353fa15828617a2cd5b70aae95e0703b
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>