drm/bridge: Put Kconfig entries in a separate menu

Put the Kconfig entries for bridge drivers into a separate menu so that
they are automatically grouped and don't clutter up the top-level menu.

While at it, move the bridge menu towards the end of the top-level menu
where the panel menu is already located.

Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index c46ca31..beaedd7 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -79,8 +79,6 @@
 
 source "drivers/gpu/drm/i2c/Kconfig"
 
-source "drivers/gpu/drm/bridge/Kconfig"
-
 config DRM_TDFX
 	tristate "3dfx Banshee/Voodoo3+"
 	depends on DRM && PCI
@@ -235,6 +233,8 @@
 
 source "drivers/gpu/drm/panel/Kconfig"
 
+source "drivers/gpu/drm/bridge/Kconfig"
+
 source "drivers/gpu/drm/sti/Kconfig"
 
 source "drivers/gpu/drm/amd/amdkfd/Kconfig"