msm: vidc: skip scaling check for decoder

Scaling check is not required for decoder as clients may not
set both input and output resolutions for decoder
in which case input and output resolution will be different
and scaling check fails if enabled.

Change-Id: Iccdbad63bd8f975df4f57cad0250557119cf788d
Signed-off-by: Karthikeyan Periasamy <kperiasa@codeaurora.org>
Signed-off-by: Govindaraj Rajagopal <grajagop@codeaurora.org>