MAINTAINERS: Update ARM/UniPhier SoCs maintainers and status

Mark the UniPhier platform maintained and Masami Hiramatsu and
Kunihiko Hayashi are taking over maintainership of the UniPhier platform.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/1617986171-20346-1-git-send-email-hayashi.kunihiko@socionext.com

'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

MAINTAINERS

@@ -2631,8 +2631,10 @@ F:	drivers/watchdog/visconti_wdt.c
 N:	visconti
 ARM/UNIPHIER ARCHITECTURE
+M:	Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
+M:	Masami Hiramatsu <mhiramat@kernel.org>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
-S:	Orphan
+S:	Maintained
 F:	Documentation/devicetree/bindings/arm/socionext/uniphier.yaml
 F:	Documentation/devicetree/bindings/gpio/socionext,uniphier-gpio.yaml
 F:	Documentation/devicetree/bindings/pinctrl/socionext,uniphier-pinctrl.yaml