media: atomisp: Drop the atomisp custom lm3554 flash driver

media: atomisp: Drop the atomisp custom lm3554 flash driver

Drop the atomisp custom lm3554 flash driver, support for flash drivers
using the custom atomisp flash interface is going to be removed from
the atomisp driver.

If flash supports for the lm3554 turns out to be necessary on some
atomisp devices in the future then this should be re-implemented
using the new include/linux/led-class-flash.h APIs.

The atomisp specific lm3554 driver could still be usable as a reference
for how to use / driver the lm3554 for a future re-implementation
using standardized APIs, but for that it can be retrieved from
the git history.

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>