MAINTAINERS: Delete inactive maintainers from AF_XDP

Delete Björn Töpel and Jonathan Lemon as maintainer and reviewer,
respectively, as they have not been contributing towards AF_XDP for
several years. I have spoken to Björn and he is ok with his removal.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Acked-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/bpf/20250915120148.2922-1-magnus.karlsson@gmail.com

Author: magnus-karlsson

CREDITS

@@ -3912,6 +3912,12 @@ S: C/ Federico Garcia Lorca 1 10-A
 S: Sevilla 41005
 S: Spain
 
+N: Björn Töpel
+E: bjorn@kernel.org
+D: AF_XDP
+S: Gothenburg
+S: Sweden
+
 N: Linus Torvalds
 E: torvalds@linux-foundation.org
 D: Original kernel hacker

MAINTAINERS

@@ -27443,10 +27443,8 @@ F:	tools/testing/selftests/bpf/*xdp*
 K:	(?:\b|_)xdp(?:\b|_)
 
 XDP SOCKETS (AF_XDP)
-M:	Björn Töpel <bjorn@kernel.org>
 M:	Magnus Karlsson <magnus.karlsson@intel.com>
 M:	Maciej Fijalkowski <maciej.fijalkowski@intel.com>
-R:	Jonathan Lemon <jonathan.lemon@gmail.com>
 R:	Stanislav Fomichev <sdf@fomichev.me>
 L:	netdev@vger.kernel.org
 L:	bpf@vger.kernel.org