btmon: Add support for decoding Basic Audio Annoucements

This adds support for decoding Basic Audio Announcements as shown
on:

Basic Audio Profile / Profile Specification
Page 36 of 146

Table 3.15: Format of BASE used in Basic Audio Announcements

< HCI Command: LE Set Periodic Advertising Data (0x08|0x003f) plen 36
        Handle: 0
        Operation: Complete ext advertising data (0x03)
        Data length: 0x21
        Service Data: Basic Audio Announcement (0x1851)
          Presetation Delay: 40000
          Number of Subgroups: 1
            Subgroup #0:
            Number of BIS(s): 1
            Codec: Reserved (0x06)
            Codec Specific Configuration: 010101020403010000020428
            Metadata: 020202
              BIS #0:
              Index: 1
              Codec Specific Configuration:
2 files changed