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 all ARM configurations.

Fixes: 7ecdea4a ("backlight: generic_bl: Remove this driver as it is unused")
Signed-off-by: NAndrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
Reviewed-by: NKrzysztof Kozlowski <krzk@kernel.org>
Acked-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: NDaniel Thompson <daniel.thompson@linaro.org>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Link: https://lore.kernel.org/r/20201201222922.3183-2-andrey.zhizhikin@leica-geosystems.com'
Signed-off-by: NArnd Bergmann <arnd@arndb.de>