arm64: dts: Update cache properties for Arm Ltd platforms

The DeviceTree Specification v0.3 specifies that the cache node
"compatible" and "cache-level" properties are required.

Cf. s3.8 Multi-level and Shared Cache Nodes
The 'cache-unified' property should be present if one of the properties
for unified cache is present ('cache-size', ...).

Update the relevant device trees nodes accordingly.

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Link: https://lore.kernel.org/r/20221107155825.1644604-6-pierre.gondois@arm.com


Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>