msm: mdss: fb: reconfigure panel if output format has changed

User modules can switch to same resolution with different format like
RGB or YUV. In cases where just the format is changing, reconfigure
the panel to switch to new format.

Change-Id: I52b11f19f576e13e197e8c576a9c5ada54416f5e
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>