Telephony: Fix NPE while opening allowed number.

Trying to edit existing allowed number caused NPE:

mNameField and mNumberField setText caused TextWatcher afterTextChanged
event while mButton is still null. So set mButton before setTexts.

Change-Id: If444e2d69c77bc10094a1dfd3fc6b700509c6128
TeleService: For Msim DSDS, set mode to 2g(all sims) prior to change

* DSDS have a wierd behavior that all sims need to be toggle to 2g before switching
to 3g or above.

Change-Id: Iccd409ea0811a2a041d0e707da6285ed5d3375cd
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_services_Telephony into android-4.4_new