Fixed registration info issues for legacy mode devices

Fixed incorrect registration info populated when
device camped on IWLAN in airplane mode. Also
added made extra wlan registration info copy when
camped on IWLAN in legacy mode. Thus the clients
do not need to check if it's in AP-assisted mode
or legacy mode.

Test: Manual + unit tests
Bug: 128679557
Bug: 128351450
Bug: 129364078

Merged-In: I6b6f7b68585088e4cdef47f27c0093769edbe02c
Change-Id: I6b6f7b68585088e4cdef47f27c0093769edbe02c
(cherry picked from commit 6a431778)