Unset platform_apis if sdk_version is already set

Unsetting platform_apis while keeping sdk_version as is does not affect
the module's deps

Test: m queryview && builozer 'print soong_module_deps' :target (to
ensure the deps aren't affected

Bug: 219755537
Change-Id: Ic0d02c5e7fec24843e4cd2541cc5106381c7180e

core/tests/PackageInstallerSessions/Android.bp

@@ -50,7 +50,6 @@ android_test {
         ":PackageManagerTestAppVersion1",
     ],
 
-    platform_apis: true,
     sdk_version: "core_platform",
     test_suites: ["device-tests"],
 }

core/tests/bugreports/Android.bp

@@ -36,7 +36,6 @@ android_test {
     ],
     test_suites: ["general-tests"],
     sdk_version: "test_current",
-    platform_apis: true,
 }
 
 filegroup {

core/tests/coretests/Android.bp

@@ -72,7 +72,6 @@ android_test {
         "libpowermanagertest_jni",
     ],
 
-    platform_apis: true,
     sdk_version: "core_platform",
     test_suites: ["device-tests"],
 

services/tests/PackageManagerServiceTests/host/test-apps/DeviceSide/Android.bp

@@ -38,5 +38,4 @@ android_test_helper_app {
         "androidx.test.rules",
         "truth-prebuilt",
     ],
-    platform_apis: true,
 }