timer_wait is moved from sunxi/psci_sun7i.S, and it can be converted
completely into a reusable armv7 generic timer. LS1021A will use it
as well.
Signed-off-by: NWang Dongsheng <dongsheng.wang@freescale.com>
Reviewed-by: NHans de Goede <hdegoede@redhat.com>
Reviewed-by: NYork Sun <yorksun@freescale.com>