arm64: defconfig: drop unused BACKLIGHT_GENERIC option

Commit 7ecdea4a ("backlight: generic_bl: Remove this driver as it is
unused") removed geenric_bl driver from the tree, together with
corresponding config option.

Remove BACKLIGHT_GENERIC config item from arm64 configuration.

Fixes: 7ecdea4a ("backlight: generic_bl: Remove this driver as it is unused")
Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Link: https://lore.kernel.org/r/20201201222922.3183-3-andrey.zhizhikin@leica-geosystems.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/configs/defconfig

@@ -698,7 +698,6 @@ CONFIG_DRM_PANFROST=m
 CONFIG_FB=y
 CONFIG_FB_MODE_HELPERS=y
 CONFIG_FB_EFI=y
-CONFIG_BACKLIGHT_GENERIC=m
 CONFIG_BACKLIGHT_PWM=m
 CONFIG_BACKLIGHT_LP855X=m
 CONFIG_LOGO=y