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/genfs_contexts b/private/genfs_contexts
index b8b7247..e300d78 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -149,6 +149,7 @@
 genfscon sysfs /devices/virtual/net             u:object_r:sysfs_net:s0
 genfscon sysfs /devices/virtual/switch          u:object_r:sysfs_switch:s0
 genfscon sysfs /devices/virtual/wakeup          u:object_r:sysfs_wakeup:s0
+genfscon sysfs /firmware/acpi/tables              u:object_r:sysfs_firmware_acpi_tables:s0
 genfscon sysfs /firmware/devicetree/base/avf u:object_r:sysfs_dt_avf:s0
 genfscon sysfs /firmware/devicetree/base/firmware/android u:object_r:sysfs_dt_firmware_android:s0
 genfscon sysfs /fs/ext4/features                  u:object_r:sysfs_fs_ext4_features:s0