vc: Allow to connect profile only when device is bonded

Fixing a race, when profile Connect message reach the native stack just
after device got unbonded.

Bug: 329781005
Test: atest bluetooth_vc_test
Flag: Exempt, Fixing race which will happen only on the stress tests
Change-Id: Iece0175b7c4894fdf5254625c8f6d289e1f42c87