Use current sdk in hardware.vibrator java backend

This change a allows usaging this target in frameworks code without
creating a cyclic dependency.

Bug: 180924179
Test: manual
Change-Id: I5f3c1598c548489dbf23edb7eb1becb985288768
diff --git a/vibrator/aidl/Android.bp b/vibrator/aidl/Android.bp
index 9766353..f6bd4cf 100644
--- a/vibrator/aidl/Android.bp
+++ b/vibrator/aidl/Android.bp
@@ -7,7 +7,7 @@
     stability: "vintf",
     backend: {
         java: {
-            platform_apis: true,
+            sdk_version: "module_current",
         },
         ndk: {
             vndk: {