Use the package name from the application info if the current package name is not available.

Summary: ActivityThread.currentPackageName() will result in a null string when called from the system server, causing a crash in JNI because it doesn't expect the name to be null.

This change is needed to support calling MediaRecorder from within the system server.

Flag: EXEMPT bugfix
Bug: 414844439

Test: Successful Build on master branch

Signed-off-by: Pratik Kathalkar <pkathalk@meta.com>
(cherry picked from https://android-review.googlesource.com/q/commit:c2a1a4c03a73551d7e31343741793cf8920ea132)
Merged-In: I1180b71e8fe36919b803e52097ddd603b6de9a5b
Change-Id: I1180b71e8fe36919b803e52097ddd603b6de9a5b