disp: msm: dsi: initialize display before request_firmware

dsi_display_init has to be called after dsi_display has valid
device info, so initialize it before calling request_firmware
in dsi firmware case.

Change-Id: Iec59882c776eb4bd19ce68d3ded052629c344d17
Signed-off-by: Ray Zhang <rayz@codeaurora.org>