Revert "Use TelecomManager.isInCall instead of TelephonyManager.getCallState"

This reverts commit c34796508035266fd5991490bb3a2301be6d0b5f.

Reason for revert: breaks tests

Bug: 257538981
Change-Id: Idadaf4a48d814d97644abe8c790d12b8912165d2
Fixes: 261505371
1 file changed