opengl: only VLC_CODEC_P010 is aligned on MSB

(cherry picked from commit 215f3720)
Signed-off-by: Thomas Guillem <thomas@gllm.fr>

modules/video_output/opengl/fragment_shaders.c

@@ -127,9 +127,7 @@ tc_yuv_base_init(opengl_tex_converter_t *tc, GLenum tex_target,
             return VLC_EGENERIC;
 
         /* Do a bit shift if samples are stored on LSB */
-        /* This is a hackish way to detect endianness. FIXME: Add bit order
-         * in vlc_chroma_description_t */
-        if ((chroma >> 24) == 'L')
+        if (chroma != VLC_CODEC_P010)
             yuv_range_correction = (float)((1 << 16) - 1)
                                  / ((1 << desc->pixel_bits) - 1);
     }