MAINTAINERS, mailmap: update Sven Peter's email address

Update my mail address to my new @kernel.org one and also add a mailmap
entry to make sure everything gets sent there for easier filtering.

Signed-off-by: Sven Peter <sven@kernel.org>
Link: https://lore.kernel.org/r/20250528221718.45204-1-sven@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Author: svenpeter42

.mailmap

@@ -717,6 +717,7 @@ Sven Eckelmann <sven@narfation.org> <sven.eckelmann@gmx.de>
 Sven Eckelmann <sven@narfation.org> <sven.eckelmann@open-mesh.com>
 Sven Eckelmann <sven@narfation.org> <sven.eckelmann@openmesh.com>
 Sven Eckelmann <sven@narfation.org> <sven@open-mesh.com>
+Sven Peter <sven@kernel.org> <sven@svenpeter.dev>
 Takashi YOSHII <takashi.yoshii.zj@renesas.com>
 Tamizh Chelvam Raja <quic_tamizhr@quicinc.com> <tamizhr@codeaurora.org>
 Taniya Das <quic_tdas@quicinc.com> <tdas@codeaurora.org>

MAINTAINERS

@@ -2251,7 +2251,7 @@ F:	sound/soc/codecs/cs42l84.*
 F:	sound/soc/codecs/ssm3515.c
 
 ARM/APPLE MACHINE SUPPORT
-M:	Sven Peter <sven@svenpeter.dev>
+M:	Sven Peter <sven@kernel.org>
 M:	Janne Grunau <j@jannau.net>
 R:	Alyssa Rosenzweig <alyssa@rosenzweig.io>
 R:	Neal Gompa <neal@gompa.dev>