video: backlight: add TI LM3532 led controller

The LM3532 is a 500-kHz fixed frequency asynchronous boost converter which
provides the power for 3 high-voltage, low-side current sinks. The device
is programmable over an I2C-compatible interface and has independent
current control for all three channels.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
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