drivers: usb: host: Add clk_set_rate to the msm_hsic driver

Due to recent change in the clock code guidelines to request the drivers
to solely control and be rate aware of the clocks that belong to
them, we need to add set_rate to all the clocks that we own.

Change-Id: Ieb66bf093c57050f62d6d3c3c131981c3724bfe8
Signed-off-by: Lena Salman <esalman@codeaurora.org>