arm64: use common reboot infrastructure

Commit 7b6d864b (reboot: arm: change reboot_mode to use enum
reboot_mode) changed the way reboot is handled on arm, which has a
direct impact on arm64 as we share the reset driver on the VE platform.

The obvious fix is to move arm64 to use the same infrastructure.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
[catalin.marinas@arm.com: removed reboot_mode = REBOOT_HARD default setting]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/system_misc.h

@@ -23,6 +23,7 @@
 #include <linux/compiler.h>
 #include <linux/linkage.h>
 #include <linux/irqflags.h>
+#include <linux/reboot.h>
 
 struct pt_regs;
 
@@ -41,7 +42,7 @@ extern void show_pte(struct mm_struct *mm, unsigned long addr);
 extern void __show_regs(struct pt_regs *);
 
 void soft_restart(unsigned long);
-extern void (*arm_pm_restart)(char str, const char *cmd);
+extern void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
 
 #define UDBG_UNDEFINED	(1 << 0)
 #define UDBG_SYSCALL	(1 << 1)

arch/arm64/kernel/process.c

@@ -132,7 +132,7 @@ void machine_restart(char *cmd)
 
 	/* Now call the architecture specific reboot code. */
 	if (arm_pm_restart)
-		arm_pm_restart('h', cmd);
+		arm_pm_restart(reboot_mode, cmd);
 
 	/*
 	 * Whoops - the architecture was unable to reboot.