Add preferred APN related SharedPref to dumpsys.

Test: manual
Bug: 128771767
Merged-in: I4e915360f5caebb3443b09da57f1cad59b933eb8
Change-Id: I4e915360f5caebb3443b09da57f1cad59b933eb8
(cherry picked from commit f5eae59605866d31d3c871bbfd878d563438449c)
1 file changed