MAINTAINERS: remove OXNAS entry

Due to lack of maintenance and stall of development for a few years now,
and since no new features will ever be added upstream, remove MAINTAINERS
entry for OXNAS files.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Daniel Golle <daniel@makrotopia.org>
Acked-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20230814-topic-oxnas-upstream-remove-v3-3-e2ba579a49d3@linaro.orgSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>

MAINTAINERS

@@ -2491,16 +2491,6 @@ S:	Maintained
 W:	http://www.digriz.org.uk/ts78xx/kernel
 F:	arch/arm/mach-orion5x/ts78xx-*
 
-ARM/OXNAS platform support
-M:	Neil Armstrong <neil.armstrong@linaro.org>
-L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
-L:	linux-oxnas@groups.io (moderated for non-subscribers)
-S:	Maintained
-F:	arch/arm/boot/dts/ox8*.dts*
-F:	arch/arm/mach-oxnas/
-F:	drivers/power/reset/oxnas-restart.c
-N:	oxnas
-
 ARM/QUALCOMM CHROMEBOOK SUPPORT
 R:	cros-qcom-dts-watchers@chromium.org
 F:	arch/arm64/boot/dts/qcom/sc7180*