ar71xx: Fix 2.4G WiFi LED of the OpenMesh MR600 board

The OpenMesh MR600(v1) can only enable the 2.4G WiFi PHY LED through the
mini-PCIe device. Not configuring the LED pin inside the platform data
makes it impossible to configure it through any standard OpenWrt tool.

Signed-off-by: Sven Eckelmann <sven@open-mesh.com>

Backport of r42184

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42363 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ar71xx/files/arch/mips/ath79/mach-mr600.c

@@ -164,6 +164,7 @@ static void __init mr600_base_setup(unsigned num_leds, struct gpio_led *leds)
 static void __init mr600_setup(void)
 {
 	mr600_base_setup(ARRAY_SIZE(mr600_leds_gpio), mr600_leds_gpio);
+	ap9x_pci_setup_wmac_led_pin(0, 0);
 }
 
 MIPS_MACHINE(ATH79_MACH_MR600, "MR600", "OpenMesh MR600", mr600_setup);