i965/vec4/nir: no need to use surface_access:: to call emit_untyped_atomic
i965/vec4/nir: no need to use surface_access:: to call emit_untyped_atomic

Now that brw_vec4_visitor::emit_untyped_atomic was removed, there is no need
to explicitly set it.

Reviewed-by: Francisco Jerez <5906ff32bdd9fd8db196f6ba5ad3afd6f9257ea5@riseup.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler