arm64: dts: apple: Add ADMAC resets on t8103/t600x

There's a shared reset for the ADMAC and MCA peripherals. The MCA node
already describes it, and being a shared reset it is important we
describe it on the ADMAC node too.

Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Signed-off-by: Hector Martin <marcan@marcan.st>