Revert "Remove sdk_version if platform_apis is set"

This reverts commit 160172d92d.

Reason for revert: Should have removed platform_apis instead because
removing platform_apis doesn't change the module deps (done in aosp/2085943)

Test: CI
Bug: 219755537
Change-Id: I9657e569d942bf845c79352a042553c6fc6b0fd3

core/tests/PackageInstallerSessions/Android.bp

@@ -51,5 +51,6 @@ android_test {
     ],
 
     platform_apis: true,
+    sdk_version: "core_platform",
     test_suites: ["device-tests"],
 }

core/tests/bugreports/Android.bp

@@ -35,6 +35,7 @@ android_test {
         "truth-prebuilt",
     ],
     test_suites: ["general-tests"],
+    sdk_version: "test_current",
     platform_apis: true,
 }
 

core/tests/coretests/Android.bp

@@ -73,6 +73,7 @@ android_test {
     ],
 
     platform_apis: true,
+    sdk_version: "core_platform",
     test_suites: ["device-tests"],
 
     certificate: "platform",

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

@@ -25,6 +25,7 @@ package {
 
 android_test_helper_app {
     name: "PackageManagerServiceDeviceSideTests",
+    sdk_version: "test_current",
     srcs: ["src/**/*.kt"],
     libs: [
         "android.test.base",