ar71xx: WNR612v2: fix kernel panic due to wrong Wifi LED init

Netgear WNR612v2 flashed with recent OpenWrt builds suffers from kernel
panic at boot during wireless chip initialization, making device
unusable:

 ath: phy0: Ignoring endianness difference in EEPROM magic bytes.
 ath: phy0: Enable LNA combining
 CPU 0 Unable to handle kernel paging request at virtual address 1000fee1, epc == 801d08f0, ra == 801d0d90
 Oops[#1]:
 CPU: 0 PID: 469 Comm: kmodloader Not tainted 4.9.120 #0
 [ ... register dump etc ... ]
 Kernel panic - not syncing: Fatal exception
 Rebooting in 1 seconds..

This simple patch fixes above error. It keeps LED table in memory after
kernel init phase for ath9k driver to operate correctly (__initdata
removed).

Also, another bug is fixed - correct array size is provided to function
that adds platform LEDs (this device has only 1 connected to Wifi chip)
preventing code from going outside array bounds.

Fixes: 1f5ea4eae4 ("ar71xx: add correct named default wireless led by using platform leds")

Signed-off-by: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>
[trimmed commit message]
Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/ar71xx/files/arch/mips/ath79/mach-wnr2000-v3.c

@@ -197,7 +197,7 @@ static struct gpio_led wnr612v2_leds_gpio[] __initdata = {
 	}
 };
 
-static struct gpio_led wnr612v2_wmac_leds_gpio[] __initdata = {
+static struct gpio_led wnr612v2_wmac_leds_gpio[] = {
 	{
 		.name		= "netgear:green:wlan",
 		.gpio		= WNR612V2_GPIO_WMAC_LED_WLAN_GREEN,
@@ -561,7 +561,7 @@ static void __init wnr612v2_setup(void)
 				 wnr612v2_leds_gpio);
 
 	ap9x_pci_setup_wmac_leds(0, wnr612v2_wmac_leds_gpio,
-				 ARRAY_SIZE(wnr612v2_leds_gpio));
+				 ARRAY_SIZE(wnr612v2_wmac_leds_gpio));
 
 	ap9x_pci_setup_wmac_btns(0, wnr612v2_wmac_keys_gpio,
 				 ARRAY_SIZE(wnr612v2_wmac_keys_gpio),