Include 1xRTT when updating set of RATs via "Allow 2G" toggle.

Update BITMASK_2G to include 1xRTT when disabling/enabling 2G
via toggle in Enable2gPreferenceController. This is to align
with TelephonyManager's NETWORK_CLASS_BITMASK_2G.

Bug: b/163168917
Test: m & atest -c Enable2gPreferenceControllerTest
Change-Id: Ia0e099b63a9089be8cd8bfd4211db9eb3c506fc3
1 file changed