i965/surface_formats: Update some formats for more recent gens
i965/surface_formats: Update some formats for more recent gens

The surface format table hasn't entirely been kept up-to-date.  This commit
marks a couple more compressed formats as sampleable on gen8+ and adds the
A4B4G4R4 format as renderable on gen9.

Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler