msm: camera: ife: Reset hw clk rate in init hw

Since down voting clock rates has been delayed in stop,
the hw clk rate value is not updated in software. And if
in a new start the required clock rate is the same as this
stale value, new requested clock rates are not voted.

Change-Id: I13c5a9ab2fd7cab93a16f2a3386ce7d6cf680681
Signed-off-by: Venkat Chinta <vchinta@codeaurora.org>