设备树中属性gpios与output-high, output-low的关系

1. gpios,output-high,output-low

	gpios=<index GPIO_ACTIVE_HIGH>	gpios=<index GPIO_ACTIVE_LOW>
active	output-high( write 1 to registers)	output-high(write 0 to registers)
inactive	output-low(write 0 to registers)	output-low(write 1 to registers)