MAINTAINERS: mark ax25 as Orphan

We haven't heard from Ralf for two years, according to lore.
We get a constant stream of "fixes" to ax25 from people using
code analysis tools. Nobody is reviewing those, let's reflect
this reality in MAINTAINERS.

Subsystem AX.25 NETWORK LAYER
  Changes 9 / 59 (15%)
  (No activity)
  Top reviewers:
    [2]: mkl@pengutronix.de
    [2]: edumazet@google.com
    [2]: stefan@datenfreihafen.org
  INACTIVE MAINTAINER Ralf Baechle <ralf@linux-mips.org>

Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240109164517.3063131-7-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

CREDITS

@@ -179,6 +179,7 @@ E: ralf@gnu.org
 P: 1024/AF7B30C1 CF 97 C2 CC 6D AE A7 FE  C8 BA 9C FC 88 DE 32 C3
 D: Linux/MIPS port
 D: Linux/68k hacker
+D: AX25 maintainer
 S: Hauptstrasse 19
 S: 79837 St. Blasien
 S: Germany

MAINTAINERS

@@ -3376,9 +3376,8 @@ F:	Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml
 F:	drivers/iio/adc/hx711.c
 
 AX.25 NETWORK LAYER
-M:	Ralf Baechle <ralf@linux-mips.org>
 L:	linux-hams@vger.kernel.org
-S:	Maintained
+S:	Orphan
 W:	https://linux-ax25.in-berlin.de
 F:	include/net/ax25.h
 F:	include/uapi/linux/ax25.h