Set IMS service state properly after RADIO becomes available

Currently canDial() method blocks placing any MO call in IMS pipe
when service state is power OFF and few other reasons.

When RADIO becomes NOT_AVAILABLE/OFF, GSM/CDMA phones set IMSPhone's
service state as POWER_OFF. This is NOT correct where there may be
cases where device may be in Airplane mode with WiFi ON and IMS
registered. Hence removed the changes in order to cater 911 calls
after APM ON/OFF, modem SSR and IMS on WiFi.

Change-Id: Id27a2ce86fd2bc5db66e3b5a01cb21bd0f6ad62e
CRs-Fixed: 731702