Disable seekbar user seeking

By default the seekbar should be disabled unless being played or the voicemails have downloaded. This first part of the seekbar update ensures that a user is not able to seek, and the seekbar will only be updated automatically when the voicemail is being played.

Bug: 7252855
Test: N/A
PiperOrigin-RevId: 183419966
Change-Id: I4e492279402d76d3e1ece03dded9b402c88138c8
8 files changed