watchdog: sama5d4_wdt: add support for sama7g5-wdt

Add support for compatible sama7g5-wdt.
The sama7g5 wdt is the same hardware block as on sam9x60.
Adapt the driver to use the sam9x60/sama7g5 variant if either
of the two compatibles are selected (sam9x60-wdt/sama7g5-wdt).

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210527100120.266796-2-eugen.hristev@microchip.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>