FROMLIST: ARM: Remove arm_pm_restart()

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

Bug: 146512338
Change-Id: I32c19f5c730bb7b02c4e474bb2292c25483d6900
Link: https://lore.kernel.org/patchwork/patch/1139631/


Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Thierry Reding <treding@nvidia.com>