MAINTAINERS: Add include/drm/drm_bridge.h to DRM DRIVERS FOR BRIDGE CHIPS

Appropriate maintainers should be suggested for changes to the
include/drm/drm_bridge.h header file, so add the header file to the
'DRM DRIVERS FOR BRIDGE CHIPS' section.
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Acked-by: Robert Foss <robert.foss@linaro.org>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230313055951.2997299-1-victor.liu@nxp.com

MAINTAINERS

@@ -6831,6 +6831,7 @@ S:	Maintained
 T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	Documentation/devicetree/bindings/display/bridge/
 F:	drivers/gpu/drm/bridge/
+F:	include/drm/drm_bridge.h
 
 DRM DRIVERS FOR EXYNOS
 M:	Inki Dae <inki.dae@samsung.com>