drm/edid: fix building error

Fixes the following building error:

CC [M]  drivers/gpu/drm/drm_edid.o
~/pie-x86_kernel/kernel/drivers/gpu/drm/drm_edid.c: In function 'cea_mode_alternate_timings':
~/pie-x86_kernel/kernel/drivers/gpu/drm/drm_edid.c:3275:2: error: call to '__compiletime_assert_3282'
declared with attribute error: BUILD_BUG_ON failed: cea_mode_for_vic(8)->vtotal != 262 || cea_mode_for_vic(9)->vtotal != 262 || cea_mode_for_vic(12)->vtotal != 262 || cea_mode_for_vic(13)->vtotal != 262 || cea_mode_for_vic(23)->vtotal != 312 || cea_mode_for_vic(24)->vtotal != 312 || cea_mode_for_vic(27)->vtotal != 312 || cea_mode_for_vic(28)->vtotal != 312
make[4]: *** [~/pie-x86_kernel/kernel/scripts/Makefile.build:265: drivers/gpu/drm/drm_edid.o] Error 1

Fixes: 7befe621 ("drm/edid: Abstract away cea_edid_modes[]")
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200203213113.28183-1-issor.oruam@gmail.com

drivers/gpu/drm/drm_edid.c

@@ -3211,7 +3211,7 @@ static u8 *drm_find_cea_extension(const struct edid *edid)
 	return cea;
 }
 
-static const struct drm_display_mode *cea_mode_for_vic(u8 vic)
+static __always_inline const struct drm_display_mode *cea_mode_for_vic(u8 vic)
 {
 	BUILD_BUG_ON(1 + ARRAY_SIZE(edid_cea_modes_1) - 1 != 127);
 	BUILD_BUG_ON(193 + ARRAY_SIZE(edid_cea_modes_193) - 1 != 219);