[piav2] Remove an invalid check.

Since getLaunchedFromPackage() is used to get the calling package name,
it cannot be null. As such, the null check in Pia V2 is redundant.

Test: atest CtsAppOps2TestCases
Bug: 330634051
Change-Id: I9c857449c8c1946fe14e424519f370090768bb9b