Move getPhoneCount implementation back to TelephonyManager.

Moving it inside iTelephony creates problems. Some components call
getPhoneCount during initialization while iTelephony service is not
even running, which will cause phone process to crash.

Bug: 123667461
Test: manual
Change-Id: I51199eaf0bd87055c21fe61af50f4c353137d621
Merged-In: I51199eaf0bd87055c21fe61af50f4c353137d621
2 files changed