Revert "Add DeviceDiagnostics.apk"

This reverts commit 3cff79686ff9535ee3a919318751b1a4fc4c53bd.

Reason: Not present in AOSP

Change-Id: If4a812327bc44d1fba880726b601971cc946147d
diff --git a/target/product/handheld_system.mk b/target/product/handheld_system.mk
index 517b0b7..697f52d 100644
--- a/target/product/handheld_system.mk
+++ b/target/product/handheld_system.mk
@@ -45,7 +45,6 @@
     CertInstaller \
     CredentialManager \
     DeviceAsWebcam \
-    DeviceDiagnostics \
     DocumentsUI \
     DownloadProviderUi \
     EasterEgg \