disp: msm: dsi: add panel mode restriction for DFPS and RFI

Add this change to ensure that DFPS and RFI happen in the
same panel mode for avoiding unexpected panel mode switch.

Change-Id: I6783b320e73a88e8f75cb83bcce85e50f798b6ab
Signed-off-by: Lei Chen <chenlei@codeaurora.org>
Signed-off-by: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>