leds: as3645a: Fix line over 80 characters

Fix the warning for line over 80 characters.

WARNING: line over 80 characters
363: FILE: drivers/leds/leds-as3645a.c:363:
	flash->flash_current = as3645a_current_to_reg(flash, true, brightness_ua);

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>