USB: HSIC SMSC HUB: Add support for pinctrl framework

As the newer targets will be using pinctrl framework for gpio
configuration, our drivers need to be compatible with both set of targets
the one which do not use pinctrl and one which do. Adding support for both
these cases. smsc hub driver can configure reset, refclk, xo-clk and int
gpios

Change-Id: I2517058f92db051cb5a650e930f424d972be16a1
Signed-off-by: Tarun Gupta <tarung@codeaurora.org>