intel/compiler: Drop unused surface opcodes

intel/compiler: Drop unused surface opcodes

The unused typed surface read/write support in the vec4 back-end has
been dropped and the fs back-end now uses SHADER_OPCODE_SEND for all
image and buffer ops.  There's no reason to keep these opcodes around
anymore.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>