Remove placeholder API from camera.provider

This API was added to work around an AIDL versioning issue that has now
been fixed.
The changed imports now count as a change to the interface, so this
placeholder API is no longer needed.

Test: m
bug: 237048744
Change-Id: I6c3edb156435b5d66578fe8250716333e0f54d6e
diff --git a/camera/provider/aidl/Android.bp b/camera/provider/aidl/Android.bp
index bb30e43..d7e613e 100644
--- a/camera/provider/aidl/Android.bp
+++ b/camera/provider/aidl/Android.bp
@@ -17,6 +17,7 @@
         "android.hardware.camera.device-V2",
         "android.hardware.camera.common-V1",
     ],
+    frozen: false,
     stability: "vintf",
     backend: {
         java: {