drivers: usb: gadget: Add bus voting to hsic gadget

HSIC needs to vote for its bus via the bus scaling mechanism.
Otherwise, it might not be able to access the bus in some cases.
The problem was seen in concurrent scenarios of USB and HSIC,
when the USB cable was unplugged and USB went to LPM. In
such cases the SNOC bus needed PNOC bus voting, that
should have beem implemented by HSIC voting for PNOC bus.

Change-Id: I6ebec0162a07a95c303048816a88a147dc469e91
Signed-off-by: Lena Salman <esalman@codeaurora.org>