msm: mdss: fix solidfill config for multi-rect pipes

In multi-rect configuration both the pipes should fetch or should
be in solidfill configuration. The change ensures that when switching
between multi-rect to normal configuration with solid fill
enable/disable the multi-rect mode properly.

CRs-Fixed:1025380
Change-Id: I02fc72583fcd9bc27156ce717b52ef17e16313d5
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>