arm64: defconfig: DRM_DUMB_VGA_DAC: follow changed config symbol name

This occurrence wasn't changed in the original rename commit.

Fixes commit 0411374b ("drm/bridge: dumb-vga-dac: Rename driver to
simple-bridge").

Link: https://lore.kernel.org/r/20200427134003.45188-2-max.krummenacher@toradex.comSigned-off-by: NMax Krummenacher <max.krummenacher@toradex.com>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

arch/arm64/configs/defconfig

@@ -610,7 +610,7 @@ CONFIG_DRM_MSM=m
 CONFIG_DRM_TEGRA=m
 CONFIG_DRM_PANEL_LVDS=m
 CONFIG_DRM_PANEL_SIMPLE=m
-CONFIG_DRM_DUMB_VGA_DAC=m
+CONFIG_DRM_SIMPLE_BRIDGE=m
 CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA=m
 CONFIG_DRM_SII902X=m
 CONFIG_DRM_THINE_THC63LVD1024=m