Revert "Ensure that only SysUI can override pending intent launch flags"

This reverts commit c4d3106e347922610f8c554de3ae238175ed393e.

Reason for revert: b/264884187, b/264885689
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:48acfb0f1d71912e757cadd505901471c1df4d4c)
Merged-In: I9fb0d66327f3f872a92e6b9d682d58489e81e6ba
Change-Id: I9fb0d66327f3f872a92e6b9d682d58489e81e6ba
1 file changed