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IMS: Don't create IMS phone when switch to SIP Phone
SIP Phone creates IMS phone while phone switch to SIP phone when dial an SIP call. Don't register receiver for Ims service state change and SRVCC state change in case of SIP phone. This way creatation of duplicate IMS phone will be prevented when switch to SIP phone. Bug: 22126128 Change-Id: I1206aaab703fec70107554352c2728e7dd42578e