msm_fb: display: Add alpha enable check in blend

FIR and M/N scalar when used for downscaling, drops
alpha channel of the given layer. To notify this, alpha_drop flag
is updated accordingly. This flag need not be checked for layers
with no alpha plane. In some scenarios alpha_drop may get enabled
for the layers with no alpha plane and cause issues realted to blend
composition of layers. Check for setting alpha_drop only if source
ayer has alpha plane.

(cherry picked from commit f270decc6b4cfd38070e4e867f01f043fbee3ea8)

Change-Id: I2703a379a346eb6138a4b4673c82983e715eb644
Signed-off-by: Mayank Chopra <makchopra@codeaurora.org>