clk: msm: Add support for 2GHz for a53ss_c1_pll

CPU clock requires to support 2GHz, so a53ss_c1_pll
PLL which drives this clock needs to have support for
the same.

Change-Id: I0e44c8eb46c3b2f3287f7763d8ce90310affd0e9
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>