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
Telephony: bugfix - let us edit 'My phone number' again

http://review.cyanogenmod.org/#/c/75688/3 introduced a change on "My Phone
Number", having the option disabled at the beginning, so it can only be used
after it has been init'd.
This commit now enables the option, when init is done.

Change-Id: I50438ac5231934b9c28d7161c05438ab4519aa8b
TeleService: Refactor sim name / sim label logic

Change-Id: I63a0a2f4d03b91289354cd9d6b51495cd622f760
TeleService: (MSIM) Avoid crashes when clicking actionbar home

Change-Id: I9cded9536cb7a6d4b709b0a70cc2628d2d8c9bda
TeleService: Don't use a progress dialog when setting subscription

Change-Id: I9b34bc8fd213a2668f9e2871fa09d80617245af4
TeleService: Move IP prefix call setting config to system property

Change-Id: I92651eaaf25ab1a8d8c7ee909a106e54529ccbb4