This is a introduction for flashlight chip RT4505

[Scope]
- One channel for one LED


[Hardware Interface]
- I2C
	* For general control
	* Slave address 0x63


[Limit]
- Torch Mode
	* Min currnet: 49.60 mA
	* Max current: 375 mA

- Strobe Mode
	* Min currnet: 93.74 mA
	* Max current: 1500 mA
	* Min protected timeout: 100 ms
	* Max protected timeout: 800 ms

