isl: Update isl_swizzle_supports_rendering comment
Bspec 57023: RENDER_SURFACE_STATE:: Shader Channel Select Red "Render Target messages do not support swapping of colors with alpha. The Red, Green, or Blue Shader Channel Selects do not support SCS_ALPHA. The Shader Channel Select Alpha does not support SCS_RED, SCS_GREEN, or SCS_BLUE." Cc: mesa-stable Signed-off-by:Sagar Ghuge <sagar.ghuge@intel.com> Reviewed-by:
Lionel Landwerlin <lionel.g.landwerlin@intel.com> Part-of: <mesa/mesa!28791>