clk: msm: gcc: Add support for 19.2MHz for MCLK clocks

MCLK clocks require to support 19.2MHz frequency,
so add support for the same.

Change-Id: If398a74af2359a4c81ff19e8716f72452a0b7fc4
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>