msm: mdss: Prevent QSEED scaling on VIG pipe with RGB data

When the VIG source side pipes are reconfigured from YUV to RGB data,
the sharpening/smoothing QSEED block is sometimes still enabled, but
it is only allowed for YUV data. This change adds a specific check if
the source format is YUV before proceeding with sharpening/smoothing
enable.

Change-Id: I5ba39f6910bb41eaed898726c9c1419699371784
Signed-off-by: Benet Clark <benetc@codeaurora.org>