clk: msm: mdss: add support for SSC feature for DSI 12nm PLL

Enable the programming sequence to add support for SSC feature
for DSI 12nm PLL as per the hardware programming guide.

Change-Id: I35348c94c2184db612fcaade25a5934e5d75ff16
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>