msm: mdss: configure pixel extension block for all formats

Pixel extension block configuration is mandatory
for all pipes and all formats on 8996. It is leading
to underrun if not configured for solid fill format or
other formats. This change configures the software pixel
extension block for all formats - with/without scaling.

Change-Id: Ie724873340c6dfd5e6cb11d66aeb0ac3aae7f841
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>