Configure WV HAL APEX to be updatable

- add "supportRebootless" to apex_manifest.json
- add <allowed-vendor-apex> sysconfig
- add "on property:apex.com.google.android.widevine.ready=true" to .rc

Now, we can test `adb install` new version of the APEX and see the
service is restarted from the new version.

Note that this doesn't mean that DRM Framework works fine with the
update.

Bug: 248192031
Test: adb install --force-non-staged \
   -i com.android.vending \
   $OUT/vendor/com.google.android.widevine.apex
Change-Id: I7c41b224f0bb55742c0023c23196bba4a09e555f

libwvdrmengine/apex/com.google.android.widevine.rc

@@ -1,8 +1,12 @@
-on apex-ready
+on property:apex.all.ready=true
     mkdir /data/vendor/mediadrm 0770 media mediadrm
 
+# Start service after update
+on property:apex.com.google.android.widevine.ready=true
+    start vendor.drm-widevine-hal
+
 service vendor.drm-widevine-hal /apex/com.google.android.widevine/bin/hw/android.hardware.drm-service.widevine
-    interface aidl android.hardware.drm::IDrmFactory/widevine
+    interface aidl android.hardware.drm.IDrmFactory/widevine
     class hal
     user media
     group media mediadrm drmrpc system