ARM: shmobile: defconfig: Refresh for v5.7-rc1

Update the defconfig for Renesas ARM boards:
  - Enable CONFIG_DRM_DISPLAY_CONNECTOR (for HDMI, VGA, and composite
    display connectors on various R-Car H1, Gen2, and RZ/G1 boards,
    since commit 0c275c30 ("drm/bridge: Add bridge driver for
    display connectors")).
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200415124923.2510-1-geert+renesas@glider.be

arch/arm/configs/shmobile_defconfig

@@ -125,6 +125,7 @@ CONFIG_VIDEO_ML86V7667=y
 CONFIG_DRM=y
 CONFIG_DRM_RCAR_DU=y
 CONFIG_DRM_PANEL_SIMPLE=y
+CONFIG_DRM_DISPLAY_CONNECTOR=y
 CONFIG_DRM_LVDS_CODEC=y
 CONFIG_DRM_SII902X=y
 CONFIG_DRM_SIMPLE_BRIDGE=y