arm64: dts: apple: Add CPU topology & cpufreq nodes for t600x

Add the missing CPU topology/capacity information and the cpufreq nodes,
so we can have CPU frequency scaling and the scheduler has the
information it needs to make the correct decisions.

As with t8103, boost states are commented out pending PSCI/etc support
for deep sleep states.

Reviewed-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Hector Martin <marcan@marcan.st>