Revert "Add direct Telecom check for call state in HFP service"

This reverts commit ae963f1c.

Reason for revert: b/286003442, b/285806759

Some Bluetooth devices will disconnect if there is no call at the time of open SCO. The change also did not fix the original bug as this seems not to come from Bluetooth.

Bug: 286003442
Bug: 285806759
(cherry picked from https://android-review.googlesource.com/q/commit:2b8630d2f6cde52f8ccaf573311b18411deb70cd)
Merged-In: Ib920e67358ba46e14f646a0c69897abcb38f50ec
Change-Id: Ib920e67358ba46e14f646a0c69897abcb38f50ec