st/mesa: Also check for PIPE_FORMAT_A8R8G8B8_SRGB for texture_sRGB

and PIPE_FORMAT_R8G8B8A8_SRGB, as well.

The reason for this is that when Virgl runs with GLES on the host, it
cannot directly upload textures in BGRA.

So to avoid a conversion step, consider the RGB sRGB formats as well for
this extension.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/mesa/state_tracker/st_extensions.c

@@ -811,7 +811,9 @@ void st_init_extensions(struct pipe_screen *screen,
       { { o(EXT_texture_sRGB),
           o(EXT_texture_sRGB_decode) },
         { PIPE_FORMAT_A8B8G8R8_SRGB,
-          PIPE_FORMAT_B8G8R8A8_SRGB },
+	  PIPE_FORMAT_B8G8R8A8_SRGB,
+	  PIPE_FORMAT_A8R8G8B8_SRGB,
+	  PIPE_FORMAT_R8G8B8A8_SRGB},
         GL_TRUE }, /* at least one format must be supported */
 
       { { o(EXT_texture_type_2_10_10_10_REV) },