v2: Some modifications were made according to the comments of the reviewers. [PATCH v2 1/3] swscale/la: Optimize hscale functions with lasx. [PATCH v2 2/3] swscale/la: Add yuv2rgb_lasx.c and rgb2rgb_lasx.c [PATCH v2 3/3] swscale/la: Add output_lasx.c file.