Bluetooth: controller: HCI commands to read codecs and controller delay

Implement HCI commands to read information about supported codecs and
controller delay.
* Read Local Supported Codecs command (v1 and v2)
* Read Local Supported Codec Capabilities command
* Read Local Supported Controller Delay command

The following functions are implemented as "weak" symbols and should
be overridden to fill in vendor-specific information into the above
commands.
* hci_vendor_read_std_codecs
* hci_vendor_read_vs_codecs
* hci_vendor_read_codec_capabilities
* hci_vendor_read_ctlr_delay

Signed-off-by: Wolfgang Puffitsch <wopu@demant.com>