Add new lazy service target to default camera HAL

Test: On walleye_svelte, reboot device and check that camera HAL is not
      running until camera app is opened
Bug: 79374634
Change-Id: Ib9968c899ce8be5a68a28b4decf0a52f96b20ec5
diff --git a/camera/provider/2.4/default/android.hardware.camera.provider@2.4-external-service.rc b/camera/provider/2.4/default/android.hardware.camera.provider@2.4-external-service.rc
index acdb200..64cf321 100644
--- a/camera/provider/2.4/default/android.hardware.camera.provider@2.4-external-service.rc
+++ b/camera/provider/2.4/default/android.hardware.camera.provider@2.4-external-service.rc
@@ -1,4 +1,5 @@
 service vendor.camera-provider-2-4-ext /vendor/bin/hw/android.hardware.camera.provider@2.4-external-service
+    interface android.hardware.camera.provider@2.4::ICameraProvider external/0
     class hal
     user cameraserver
     group audio camera input drmrpc usb