vl: support luma keying for interlaced surfaces as well
vl: support luma keying for interlaced surfaces as well

We had the CSC code twice in there, factor it out into a separate function.

Signed-off-by: Christian König <c7ea837d7a46effe4232b086213468b8b31643bf@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler