drivers: qpnp-smbcharger: Fix USB3.0 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.

Change-Id: I9bf935add569f70c14bf9cd4197d6e86163da6f5
Signed-off-by: Naitik Bharadiya <bharad@codeaurora.org>