msm: mdss: ensure correct dsi phy init sequence is called

The DSI phy init sequence differs based on the hardware version and
the driver needs to execute the corresponding sequence appropriately.
Commit I0564216737cc6e98c1e8658862cf7af5dabd363c introduced a bug which
removes the hardware version check resulting in the incorrect phy
init sequence being called. Fix this by adding the required version
checks back in the driver.

Change-Id: Ia48f5dd7986920b9064b66c1de7c6abe10bcd365
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>