msm: clock-8226: Set kpss_ahb_clk rate to SVS

The kpss_ahb_clk is configured to run at 75 MHz by APPs PBL. This requires
nominal voltage. Therefore, reconfigure the clock to run at a rate
supported by SVS in post_init.

Change-Id: Ic7ddb9d1e90b256e3973963b1a1db4ce549adc58
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>