Add sepolicy for ACPI bert_collector

bert_collector is a deamon that runs at boot, collects ACPI BERT
reports and sends them to DropBox.

Adds bert_collector.te policy for bert_collector deamon permissions.

Adds sysfs_firmware_acpi_tables context for /sys/firmware/acpi/tables.

Adds property acpi.bert_collector.start for starting bert_collector.

Bug: 357626966
Test: m && atest bert_collector_test

Change-Id: I4c583f3a9121474235ea8c78f65b74df86936a0b
diff --git a/private/property_contexts b/private/property_contexts
index f7e81fd..24462cb 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -870,6 +870,8 @@
 
 dmesgd.start u:object_r:dmesgd_start_prop:s0 exact bool
 
+acpi.bert_collector.start u:object_r:bert_collector_start_prop:s0 exact bool
+
 odsign.key.done u:object_r:odsign_prop:s0 exact bool
 odsign.verification.done u:object_r:odsign_prop:s0 exact bool
 odsign.verification.success u:object_r:odsign_prop:s0 exact bool