msm: mdss: update DSI PHY enable sequence based on PHY revision

In the current implementation DSI controller version is used to
determine which PHY enable sequence should be used. But this will
fail in case of platforms where DSI controller version is same as
older platforms but PHY version is new. So change the version check
to be based on PHY version instead for controller version.

Change-Id: I636a6442e84f1bd549b6a125cfb991402e53c796
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>