Correct argument order in permission check

The function 'checkAccess' recieves the uid and pid in that order and
forwards them to checkSlicePermission in the same order. However,
checkSlicePermission expects them in the opposite order.

Bug: 135551349
Test: atest FrameworksUiServicesTests
Change-Id: I6e49efeab08f0e2a29d9830e6f81905598ae410c
(cherry picked from commit d2432fc3)