platform: msm: Fix USB device does not enumerate in SS mode

The max speed for the USB device is high speed. So
the device is always enumerated in high speed indpendent
of the connection. Fix this by setting the EXTCON_USB_SPEED
to 1 which in turn sets the max speed as super speed.

CRs-Fixed: 2108100
Change-Id: I8f313cc3ee015a1340ab78650e17334ca85ddd27
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>