This commit adds support for the Armada 375 and Armada 380 SoCs.

This SoC variant has a second RSTOUT register, in addition to the already
existent, which is shared with the system-controller. To handle this RSTOUT,
we introduce a new MMIO register 'rstout_mask' to be required on
'armada-{375,380}-watchdog' new compatible string.
Signed-off-by: NEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Acked-by: NJason Cooper <jason@lakedaemon.net>
Tested-by: NJason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>