Telephony(MSIM): Disable DDS Switch in Airplane Mode.

Do not allow user to change the DDS in Airplane Mode
as modem will be in LPM state.

Change-Id: I21ceaa53df6f0acd7be5fb8f23a120f92023a152
CRs-Fixed: 594616
Merge "Telephony(MSIM): Disable DDS Switch in Airplane Mode." into cm-11.0
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_Settings into cm-11.0