drm/panel: consolidate unnecessary explicit dependencies

DRM_PANEL_LD9040 and DRM_PANEL_S6E8AA0 both explicitly depended on
DRM_PANEL && DRM, whereas DRM_PANEL_SIMPLE relies upon the dependency
on the menu.

We do not need to use explicit dependencies if we make the menu depend
on DRM_PANEL && DRM - this will implicitly make each entry in the menu
depend on DRM_PANEL && DRM without this needing to be explicitly stated
against every entry.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/panel/Kconfig

@@ -5,7 +5,7 @@ config DRM_PANEL
 	  Panel registration and lookup framework.
 
 menu "Display Panels"
-	depends on DRM_PANEL
+	depends on DRM && DRM_PANEL
 
 config DRM_PANEL_SIMPLE
 	tristate "support for simple panels"
@@ -18,14 +18,12 @@ config DRM_PANEL_SIMPLE
 
 config DRM_PANEL_LD9040
 	tristate "LD9040 RGB/SPI panel"
-	depends on DRM && DRM_PANEL
 	depends on OF
 	select SPI
 	select VIDEOMODE_HELPERS
 
 config DRM_PANEL_S6E8AA0
 	tristate "S6E8AA0 DSI video mode panel"
-	depends on DRM && DRM_PANEL
 	depends on OF
 	select DRM_MIPI_DSI
 	select VIDEOMODE_HELPERS