zero-sugar: drop touch power control initialization

Touch is not needed in U-Boot, so it makes more sense to get kernel
initialize power for touch.  Let's drop the code from U-Boot.  The bonus
point is that we get U-Boot boot up faster now, as the delay for power
control is gone.  If we can drop the digitizer power control later (if
not needed), another 1 second delay can be gone as well, and kernel has
been ready to initialize power for both touch and digitizer anyway.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

board/reMarkable/zero-sugar/Makefile

@@ -7,7 +7,6 @@ obj-y  := zero-sugar.o \
           uart_init.o \
           epd_pmic_init.o \
           epd_display_init.o \
-          touch_init.o \
           digitizer_init.o \
           charger_init.o \
           serial_download_trap.o \

board/reMarkable/zero-sugar/touch_init.c

@@ -1,9 +0,0 @@
-#include <asm/arch/sys_proto.h>
-#include <asm/gpio.h>
-
-void zs_do_config_touch_powerctrl_pins(void)
-{
-    printf("Turning on touch power..\n");
-    gpio_request(IMX_GPIO_NR(1, 11), "TOUCH_PWR_EN");
-    gpio_direction_output(IMX_GPIO_NR(1, 11), 1);
-}

board/reMarkable/zero-sugar/touch_init.h

@@ -1,6 +0,0 @@
-#ifndef TOUCH_INIT_H
-#define TOUCH_INIT_H
-
-void zs_do_config_touch_powerctrl_pins(void);
-
-#endif

board/reMarkable/zero-sugar/zero-sugar.c

@@ -11,7 +11,6 @@
 #include "uart_init.h"
 #include "epd_display_init.h"
 #include "epd_pmic_init.h"
-#include "touch_init.h"
 #include "digitizer_init.h"
 #include "charger_init.h"
 #include "serial_download_trap.h"
@@ -73,10 +72,6 @@ static void power_perfs(void)
 	// Shutdown LCDIF
 	lcdif_power_down();
 
-    /* TOUCH */
-    zs_do_config_touch_powerctrl_pins();
-    udelay(500000);
-
 	/* DIGITIZER */
     zs_do_config_digitizer_powerctrl_pins();
     udelay(1000000);