freedreno/a3xx: add 16-bit unorm/snorm texture formats
freedreno/a3xx: add 16-bit unorm/snorm texture formats

Signed-off-by: Ilia Mirkin <bcbbb7aa705ec3a5fc5824c01a845186c3d62fca@alum.mit.edu>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler