Add tracing for updateAppFreezeStateLSP.

This outputs process state / metadata to traces which is useful in
troubleshooting why a process is not frozen.

Test: m and then record a trace.
Bug: 345547733
Flag: com.android.server.am.trace_update_app_freeze_state_lsp
Change-Id: I37652ffa5181995322819da9760b9ba54d89623b