radeonsi: unify the constant load paths
radeonsi: unify the constant load paths

Remove the split between direct and indirect.

Reviewed-by: Marek Olšák <8c7344a1abdb103e79ecfd488098373070c3c70e@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler