clk: qcom: cmn_blk: Add support for Common block PLL

On target like qcs405, Common block PLL is required
for USB and PCIE subsystems. Add support for common
block pll so that client driver can vote and unvote
it as per requirement.

Change-Id: Idf6db3f4585fe73f4f9087ec0db7551c0fb6f862
Signed-off-by: Shefali Jain <shefjain@codeaurora.org>