USB: dwc3-msm: Turn on core & iface clks before accessing AHB2PHY registers

On some platforms, USB3 controller sits on PCNOC instead of SNOC.
In this case, it is required to turn on core_clks, iface_clk(pcnoc_axi_clk)
and cfg_ahb_clk before accessing AHB2PHY register. Hence make
required change for turning on clks required before AHB2PHY register
access.

Change-Id: Id0de545338e06036f956fc1d495be08df4efdcce
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>