bootstat: introduce sys.boot.reason

Add access to [persist.]sys.boot.reason, pstore, dmesg and logcat

Test: system/core/bootstat/boot_reason_test.sh
Bug: 63736262
Change-Id: Id521609308e0e967b24d7558982b30a1fc4c0a32

public/bootstat.te

@@ -14,5 +14,19 @@ r_dir_file(bootstat, proc)
 # Collect metrics on boot time created by init
 get_prop(bootstat, boottime_prop)
 
-# Read ro.boot.bootreason
-get_prop(bootstat, bootloader_boot_reason_prop)
+# Read/Write [persist.]sys.boot.reason and ro.boot.bootreason (write if empty)
+set_prop(bootstat, bootloader_boot_reason_prop)
+set_prop(bootstat, system_boot_reason_prop)
+set_prop(bootstat, last_boot_reason_prop)
+
+# ToDo: TBI move access for the following to a system health HAL
+
+# Allow access to /sys/fs/pstore/ and syslog
+allow bootstat pstorefs:dir search;
+allow bootstat pstorefs:file r_file_perms;
+allow bootstat kernel:system syslog_read;
+
+# Allow access to reading the logs to read aspects of system health
+read_logd(bootstat)
+
+# ToDo: end