Don't allow SdkSandbox to bypass systemUid check. Test: atest Flag: EXEMPT security fix Bug: 397438392 (cherry picked from commit d400709160c8374d83a15dc7623b11434c08c4c6) (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:3eb6e9bf403d4b42762f15f55875cbb75039edea) Merged-In: I1003ac2a795c869aaeb292692b2681c7a5c8d12e Change-Id: I1003ac2a795c869aaeb292692b2681c7a5c8d12e