MAINTAINERS: arm: apple: Add Janne as maintainer

Sven and I have agreed to share the maintainership for the ARM/APPLE
platform after Marcan's step down. I'm handling the downstream Asahi
Linux tree since April 2024 and worked on or wrote several drivers for
the platform.

Signed-off-by: Janne Grunau <[email protected]>
Acked-by: Sven Peter <[email protected]>
Acked-by: Hector Martin <[email protected]>
Acked-by: Neal Gompa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>

Author: jannau

MAINTAINERS

@@ -2210,6 +2210,7 @@ F:	sound/soc/codecs/ssm3515.c
 
 ARM/APPLE MACHINE SUPPORT
 M:	Sven Peter <[email protected]>
+M:	Janne Grunau <[email protected]>
 R:	Alyssa Rosenzweig <[email protected]>
 L:	[email protected]
 L:	[email protected] (moderated for non-subscribers)