imlib: Fix SIMD YCbCr to RGB conversion.
imlib: Fix SIMD YCbCr to RGB conversion.

* Fixes #1597

iabdalkader/openmv,iabdalkader/openmv,openmv/openmv,kwagyeman/openmv,iabdalkader/openmv,openmv/openmv,iabdalkader/openmv,openmv/openmv,kwagyeman/openmv,kwagyeman/openmv,openmv/openmv,kwagyeman/openmv