Add missing feature descriptions to hci_features2str().

The list of possible features in hccontrol/features2str() is incomplete.
Refer to "Bluetooth Core Specification 5.2 Vol. 2 Part C. 3.3 Feature Mask Definition".

Submitted by: Marc Veldman <marc@bumblingdork.com>
PR: 245354
MFC after: 1 week
Sponsored by: Mellanox Technologies