This is required to save the AAA root CA certs for PPS MO. Put @hide for new API because this is only used for wifi service. Bug: 117717842 Test: ./frameworks/base/wifi/tests/runtests.sh Test: tested with R1 AP for installing profile and R2 AP for connection Change-Id: Ib84c030024d3429140cd80bb622fd23ca608b9bb Signed-off-by: Ecco Park <eccopark@google.com>