arm64: dts: apple: Rename dart-sio* to sio-dart*

All the other DARTs are named foo-dart, so let's keep things consistent.

Fixes: 51979fbb ("arm64: dts: apple: t600x: Add MCA and its support")
Fixes: 8a3df85a ("arm64: dts: apple: t8103: Add MCA and its support")
Reviewed-by: Sven Peter <sven@svenpeter.dev>
Reviewed-by: Mark Kettenis <kettenis@openbsd.org>
Signed-off-by: Hector Martin <marcan@marcan.st>