Unset platform apis when sdk_version is already set

Similar to ag/18129686, unsetting platform_apis while sdk_version
doesn't affect the build of the module

Test: CI
Bug: 219755537
Change-Id: I4ec2e56f7c9d876d2c246132b296b7c6ecbab9bc
diff --git a/java/tests/Android.bp b/java/tests/Android.bp
index fdabc4e..20cde8d 100644
--- a/java/tests/Android.bp
+++ b/java/tests/Android.bp
@@ -29,7 +29,6 @@
     ],
     test_suites: ["general-tests"],
     sdk_version: "core_platform",
-    platform_apis: true,
     compile_multilib: "both",
 
     dont_merge_manifests: true,