[PATCH RESEND 09/16] backlight: ti-lmu-backlight: add LM3631 driver

LM3631 has 2 backlight strings and 11 bit dimming is supported. PWM brightness control is also supported. Common backlight driver is controlled by TI LMU backlight driver. Only LM3631 specific code is implemented here. Cc: Jingoo Han Cc: Lee Jones Cc: linux-kernel@vger.kernel.org

[PATCH RESEND 09/16] backlight: ti-lmu-backlight: add LM3631 driver

LM3631 has 2 backlight strings and 11 bit dimming is supported. PWM brightness control is also supported. Common backlight driver is controlled by TI LMU backlight driver. Only LM3631 specific code is implemented here. Cc: Jingoo Han Cc: Lee Jones