MAINTAINERS: step down as maintainer of UniPhier SoCs and Denali driver

I am leaving Socionext. Orphan the UniPhier platform and Denali NAND
driver until somebody takes the role.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

MAINTAINERS

@@ -2642,10 +2642,8 @@ F:	drivers/pinctrl/visconti/
 N:	visconti
 
 ARM/UNIPHIER ARCHITECTURE
-M:	Masahiro Yamada <yamada.masahiro@socionext.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
-S:	Maintained
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-uniphier.git
+S:	Orphan
 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
@@ -5006,9 +5004,8 @@ T:	git git://linuxtv.org/media_tree.git
 F:	drivers/media/platform/sti/delta
 
 DENALI NAND DRIVER
-M:	Masahiro Yamada <yamada.masahiro@socionext.com>
 L:	linux-mtd@lists.infradead.org
-S:	Supported
+S:	Orphan
 F:	drivers/mtd/nand/raw/denali*
 
 DESIGNWARE EDMA CORE IP DRIVER