OMAP3 GPIO reset pin

take omap3-evm as reference

1. xxxx.h for mux

MUX_VAL(CP(GPMC_WAIT2), (IEN | PTU | EN | M4)) /*GPIO_64*/\

2. xxx.c for set h-l-h pulse

/* Make GPIO 64 as output pin */
writel(readl(&gpio3_base->oe) & ~(GPIO0), &gpio3_base->oe);

/* Now send a pulse on the GPIO pin */
writel(GPIO0, &gpio3_base->setdataout);
udelay(1);
writel(GPIO0, &gpio3_base->cleardataout);
udelay(1);
writel(GPIO0, &gpio3_base->setdataout);