MAINTAINERS: remove historic section DEVICE NUMBER REGISTRY

As described in Documentation/admin-guide/devices.rst, the device number
registry (or linux device list) is at Documentation/admin-guide/devices.txt
and no longer maintained at lanana.org.

The devices.txt file is basically community-maintained, and there is no
other dedicated maintainer or contact for that file nowadays.

Remove the historic section DEVICE NUMBER REGISTRY in MAINTAINERS.

Signed-off-by: Lukas Bulwahn <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Corbet <[e-mail]>

MAINTAINERS

···
 F:	include/dt-bindings/pmu/exynos_ppmu.h
 F:	include/linux/devfreq-event.h
 
-DEVICE NUMBER REGISTRY
-M:	Torben Mathiasen <[e-mail]>
-S:	Maintained
-W:	http://lanana.org/docs/device-list/index.html
-
 DEVICE RESOURCE MANAGEMENT HELPERS
 M:	Hans de Goede <[e-mail]>
 R:	Matti Vaittinen <[e-mail]>