drivers: led: Add LED driver support for TLC59108

Add support for TI TLC59108 an I2C 8-bit LED driver.
Supported blinkink period: 41ms to 10730ms
Supported brightness value: 0 to 100%

This driver supports the following APIs:

1. led_blink
2. led_set_brightness
3. led_on
4. led_off

This is a modified version of the NXP PCA9633 driver.

Signed-off-by: John Kjellberg <kjellberg.john@gmail.com>