Test NetworkRegistrationInfo#getRegisteredPlmn

Add a test to ensure that NRI#getRegisteredPlmn() returns
a valid PLMN ID on all registered NRIs, excepting CDMA
and IWLAN.

Bug: 149338200
Test: atest \
TelephonyManagerTest#testNetworkRegistrationInfoRegisteredPlmn

Merged-In: Ib673605bbad14b65a3ff3031cd5f9c27cec75083
Change-Id: Ib673605bbad14b65a3ff3031cd5f9c27cec75083
(cherry picked from commit 2994688aab46409098c50f843a9fdab2576a23fb)
1 file changed