ARM: 9095/1: ARM64: Remove arm_pm_restart()

ARM: 9095/1: ARM64: Remove arm_pm_restart()

All users of arm_pm_restart() have been converted to use the kernel
restart handler.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>