Add profcollectd.etr.probe property and associated permissions

It is used by profcollectd to notify vendor_init to trigger
a manual probe of coresight etr.

Bug: 321061072
Test: build and run on device
Change-Id: I5aa65f8d5a25f1284f09111c940f0a2c1a62ac18
diff --git a/private/property_contexts b/private/property_contexts
index fd1b848..b4458ee 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -109,6 +109,7 @@
 sys.trace.              u:object_r:system_trace_prop:s0
 wrap.                   u:object_r:zygote_wrap_prop:s0 prefix string
 persist.wm.debug.       u:object_r:persist_wm_debug_prop:s0
+profcollectd.etr.probe  u:object_r:profcollectd_etr_prop:s0
 
 # Suspend service properties
 suspend.max_sleep_time_millis u:object_r:suspend_prop:s0 exact uint