Fix context for mapping/xx.yy.compat.cil files

The current file_contexts regular expression did not include the
.compat part of the policy.

Before:
  # ls -alZ /system/etc/selinux/mapping
  drwxr-xr-x 2 root root u:object_r:system_file:s0       332 2009-01-01 00:00 .
  drwxr-xr-x 3 root root u:object_r:system_file:s0       376 2009-01-01 00:00 ..
  -rw-r--r-- 1 root root u:object_r:sepolicy_file:s0  224062 2009-01-01 00:00 10000.0.cil
  -rw-r--r-- 1 root root u:object_r:sepolicy_file:s0  112668 2009-01-01 00:00 29.0.cil
  -rw-r--r-- 1 root root u:object_r:system_file:s0      1003 2009-01-01 00:00 29.0.compat.cil
  -rw-r--r-- 1 root root u:object_r:sepolicy_file:s0  125916 2009-01-01 00:00 30.0.cil
  -rw-r--r-- 1 root root u:object_r:system_file:s0      1059 2009-01-01 00:00 30.0.compat.cil
After:
  # ls -alZ /system/etc/selinux/mapping
  drwxr-xr-x 2 root root u:object_r:system_file:s0       332 2023-10-06 03:40 .
  drwxr-xr-x 3 root root u:object_r:system_file:s0       376 2023-10-06 03:40 ..
  -rw-r--r-- 1 root root u:object_r:sepolicy_file:s0  224062 2023-10-04 22:58 10000.0.cil
  -rw-r--r-- 1 root root u:object_r:sepolicy_file:s0  112668 2023-10-04 22:58 29.0.cil
  -rw-r--r-- 1 root root u:object_r:sepolicy_file:s0    1003 2023-09-06 01:51 29.0.compat.cil
  -rw-r--r-- 1 root root u:object_r:sepolicy_file:s0  125916 2023-10-04 22:58 30.0.cil
  -rw-r--r-- 1 root root u:object_r:sepolicy_file:s0    1059 2023-09-06 01:51 30.0.compat.cil

Test: boot cf & inspect new labels
Bug: 299839280
Change-Id: Ic833ccf59a6c75b0757df9de6e3fed0992839c74
diff --git a/private/file_contexts b/private/file_contexts
index 1049273..67cd476 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -343,7 +343,7 @@
 /system/etc/passwd                      u:object_r:system_passwd_file:s0
 /system/etc/seccomp_policy(/.*)?        u:object_r:system_seccomp_policy_file:s0
 /system/etc/security/cacerts(/.*)?      u:object_r:system_security_cacerts_file:s0
-/system/etc/selinux/mapping/[0-9]+\.[0-9]+\.cil       u:object_r:sepolicy_file:s0
+/system/etc/selinux/mapping/[0-9]+\.[0-9]+(\.compat)?\.cil       u:object_r:sepolicy_file:s0
 /system/etc/selinux/plat_mac_permissions\.xml u:object_r:mac_perms_file:s0
 /system/etc/selinux/plat_property_contexts  u:object_r:property_contexts_file:s0
 /system/etc/selinux/plat_service_contexts  u:object_r:service_contexts_file:s0