Revert "RIL: Make RIL subclassable"

This reverts commit 89dc3d2f0369c3801de5a18b70f64a82d46a05f4

Change-Id: Iedb11ea91e1fbedeb060938771dafabc1e5e8fd9
Merge "Revert "RIL: Make RIL subclassable"" into jellybean