panfrost: Bump ESSL_FEATURE_LEVEL on Valhall

This advertises ARB_gpu_shader5 on Valhall, which should be working now. On the
GLES3.1 side, this notably adds support for sample variables and dynamic offsets
for texture gathers, both of which should now be working.

No shader-db changes.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17101>

src/gallium/drivers/panfrost/pan_screen.c

@@ -195,7 +195,7 @@ panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
         case PIPE_CAP_GLSL_FEATURE_LEVEL_COMPATIBILITY:
                 return is_gl3 ? 330 : 140;
         case PIPE_CAP_ESSL_FEATURE_LEVEL:
-                return pan_is_bifrost(dev) ? 320 : 310;
+                return dev->arch >= 6 ? 320 : 310;
 
         case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
                 return 16;