clk: qcom: mdss: Add support for 10nm C-PHY shadow clock

Add support for 10nm DSI PLL C-PHY shadow clocks, which
will be used during dynamic dsi clock switch.

Change-Id: If5143b992e8ea990983658c1e804d2eb6365a683
Signed-off-by: Ritesh Kumar <riteshk@codeaurora.org>