msm: jpeg: Round the clock rate before setting

clock has different rates. Once desired clock rate is calculated,
call clk_roundrate() to get supported clk rate and set it using
clk_setrate().So we rounded the desired clock rate to get the
supported value for the corresponding modules.

Change-Id: If83b2908aa7ab51077581ae4b721d2f37bfc2a74
Signed-off-by: Sunid Wilson <sunidw@codeaurora.org>