ARM: SAMSUNG: Rework private data handling in dev-backlight
ARM: SAMSUNG: Rework private data handling in dev-backlight

This patch modifies dev-backlight helpers to get private data using
container_of instead of abusing platform_data field of PWM device.

Signed-off-by: Tomasz Figa <69861c78e6f8ec8c6fbfd1c06050c87cda6b23eb@gmail.com>
Reviewed-by: Sylwester Nawrocki <1ca386fdc5066df13f7236f0837f22126191d06b@samsung.com>
Tested-by: Heiko Stuebner <9ab5f52a1ca0bcf4f70d6d9008e02f6134b5b8f2@sntech.de>
Tested-by: Mark Brown <b51b9a92386687a9ac927cebfa0f978adeb8cea5@linaro.org>
Tested-by: Sylwester Nawrocki <3ec980a5bae855ae8ff893bb06e50918b93af134@gmail.com>
Acked-by: Arnd Bergmann <f2c659f01951776204a6c5b902787d9019fbeebd@arndb.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs