ar71xx: disable irq on reboot to fix hang issues (fixes #17839)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 42955

target/linux/ar71xx/patches-3.10/728-MIPS-ath79-fix-restart.patch

+--- a/arch/mips/ath79/setup.c
++++ b/arch/mips/ath79/setup.c
+@@ -40,6 +40,7 @@ static char ath79_sys_type[ATH79_SYS_TYP
+ 
+ static void ath79_restart(char *command)
+ {
++	local_irq_disable();
+ 	ath79_device_reset_set(AR71XX_RESET_FULL_CHIP);
+ 	for (;;)
+ 		if (cpu_wait)

target/linux/ar71xx/patches-3.14/728-MIPS-ath79-fix-restart.patch

+--- a/arch/mips/ath79/setup.c
++++ b/arch/mips/ath79/setup.c
+@@ -40,6 +40,7 @@ static char ath79_sys_type[ATH79_SYS_TYP
+ 
+ static void ath79_restart(char *command)
+ {
++	local_irq_disable();
+ 	ath79_device_reset_set(AR71XX_RESET_FULL_CHIP);
+ 	for (;;)
+ 		if (cpu_wait)