telephony: Change findAndRemoveRequestFromList to protected

This fixes issues on ariesve, galaxysmtd and most msm7x30!

Update findAndRemoveRequestFromList to be protected instead of private to match how it was on android-4.3.
Fix bug introduced by Ia044b6715636fd3a6a0a173e3f2d6599fbc8d597

Change-Id: I16893e10f4eb5ded7a5cb4133e275a987dc8da14