Revert "use new TelephonyManager API preferred_network_type"

This reverts commit cb6b699bde7965f3e33ee0af10bd22b6955fdd8b.

Reason for revert: Causing failures on git_pi-dev-plus-aosp for docs and aosp_sailfish.

Change-Id: I19b2c2408ae1800e88333ec2f39f7f5c00deda8e
Merged-In: Id2c8766a6c707dcea141409ebede02de399cbeb7
1 file changed