panfrost: Expose NIR as our PIPE_SHADER_CAP_SUPPORTED_IRS

We *could* expose TGSI as well -- we pipe it through tgsi_to_nir for
Gallium-internal shaders anyway -- but we'd rather not.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

src/gallium/drivers/panfrost/pan_screen.c

@@ -320,7 +320,7 @@ panfrost_get_shader_param(struct pipe_screen *screen,
                 return PIPE_SHADER_IR_NIR;
 
         case PIPE_SHADER_CAP_SUPPORTED_IRS:
-                return 0;
+                return (1 << PIPE_SHADER_IR_NIR);
 
         case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
                 return 32;