arm64: defconfig: DRM_DUMB_VGA_DAC: follow changed config symbol name

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

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

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Max Krummenacher <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

Author: MaxKrummenacher

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