plat/rockchip: initialize reset and poweroff GPIOs with known invalid value

And return NULL if we didn't get them in bl aux params otherwise reset and poweroff
will be broken on platforms that do not have reset and poweroff GPIOs.

Fixes: c1185ffd

 ("plat/rockchip: Switch to use new common BL aux parameter library")
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Change-Id: Ic6cf6383d8f05d745e2c5d5e1b1df38514ea8429

plat/rockchip/common/params_setup.c

@@ -6,6 +6,7 @@
 
 #include <assert.h>
 #include <errno.h>
+#include <limits.h>
 #include <string.h>
 
 #include <lib/bl_aux_params/bl_aux_params.h>
@@ -21,8 +22,8 @@
 #include <plat_params.h>
 #include <plat_private.h>
 
-static struct bl_aux_gpio_info rst_gpio;
-static struct bl_aux_gpio_info poweroff_gpio;
+static struct bl_aux_gpio_info rst_gpio = { .index = UINT_MAX } ;
+static struct bl_aux_gpio_info poweroff_gpio = { .index = UINT_MAX };
 static struct bl_aux_gpio_info suspend_gpio[10];
 uint32_t suspend_gpio_cnt;
 static struct bl_aux_rk_apio_info suspend_apio;
@@ -174,11 +175,17 @@ uint32_t rockchip_get_uart_clock(void)
 
 struct bl_aux_gpio_info *plat_get_rockchip_gpio_reset(void)
 {
+	if (rst_gpio.index == UINT_MAX)
+		return NULL;
+
 	return &rst_gpio;
 }
 
 struct bl_aux_gpio_info *plat_get_rockchip_gpio_poweroff(void)
 {
+	if (poweroff_gpio.index == UINT_MAX)
+		return NULL;
+
 	return &poweroff_gpio;
 }