Override AIDL CAS HAL if HIDL is built

android.hardware.cas@1.2-service gets built when API level is less than
or equal to 33, but com.android.hardware.cas gets built regardless,
this results in both getting built.

Test: m, observe CAS APEX not present for a device with a shipping API
      level of 30, inheriting base_vendor.mk.
Change-Id: I838cdaa31e38277a73bd22acb7b2490f076e779c
diff --git a/cas/1.2/default/Android.bp b/cas/1.2/default/Android.bp
index 38561fd..5bc8bad 100644
--- a/cas/1.2/default/Android.bp
+++ b/cas/1.2/default/Android.bp
@@ -46,6 +46,7 @@
     vintf_fragments: ["android.hardware.cas@1.2-service.xml"],
     defaults: ["cas_service_defaults@1.2"],
     init_rc: ["android.hardware.cas@1.2-service.rc"],
+    overrides: ["com.android.hardware.cas"],
 }
 
 cc_binary {