radeonsi: don't use tgsi_parse_context to get processor type
radeonsi: don't use tgsi_parse_context to get processor type

Also remove unused "tokens".

Reviewed-by: Michel Dänzer <242b79f0804cf52679d58f27ed754158c1323c75@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler