usb: gadget: Add HSIC peripheral support.

Add Support for HSIC peripheral(device). Currently only
one USB core can be used by default. To enable HSIC core
need to enable it from defconfig.

Change-Id: I02413658e28f799de2a083db7847fb8b01d04eac
Signed-off-by: Ofir Cohen <ofirc@codeaurora.org>
Signed-off-by: Tarun Gupta <tarung@codeaurora.org>