Revert^2 "Add CAS HAL APEX"

8b19286ce39adec54b7716e522e4efc5c5b3f455

This relands the CAS HAL APEX.

Bug: 297467514
Test: atest CtsMediaMiscTestCases:MediaCasTest
Change-Id: I741d059688ac65f42bed45e068cd00ccc5d631f5
diff --git a/cas/aidl/default/file_contexts b/cas/aidl/default/file_contexts
new file mode 100644
index 0000000..98bde53
--- /dev/null
+++ b/cas/aidl/default/file_contexts
@@ -0,0 +1,3 @@
+(/.*)?                                                          u:object_r:vendor_file:s0
+/etc(/.*)?                                                      u:object_r:vendor_configs_file:s0
+/bin/hw/android\.hardware\.cas-service\.example                 u:object_r:hal_cas_default_exec:s0