freedreno/a6xx: add 'type' to shader state key

freedreno/a6xx: add 'type' to shader state key

We could have identical texture state for both VS and FS.. which would
result in VS state getting created first, and FS state mapping to the
identical cmdstream.  Resulting in VS state getting emitted twice and no
FS state emitted.

Fixes:
  dEQP-GLES2.functional.uniform_api.value.assigned.by_pointer.render.basic_array.sampler2D_both
  dEQP-GLES2.functional.uniform_api.value.assigned.by_pointer.render.struct_in_array.sampler2D_samplerCube_both
  dEQP-GLES2.functional.uniform_api.value.assigned.by_pointer.render.array_in_struct.sampler2D_samplerCube_both
  dEQP-GLES2.functional.uniform_api.value.assigned.by_pointer.render.nested_structs_arrays.sampler2D_samplerCube_both
  dEQP-GLES2.functional.uniform_api.value.assigned.by_value.render.nested_structs_arrays.sampler2D_samplerCube_both
  dEQP-GLES31.functional.program_uniform.by_pointer.render.array_in_struct.sampler2D_samplerCube_both
  dEQP-GLES31.functional.program_uniform.by_pointer.render.nested_structs_arrays.sampler2D_samplerCube_both
  dEQP-GLES31.functional.program_uniform.by_value.render.nested_structs_arrays.sampler2D_samplerCube_both

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Eric Anholt <eric@anholt.net>