x86: High-Definition Audio Driver

High-definition audio driver, audiohd(7d), is enhanced to support more audio CODECs and provide basic audio playback and recording functionality. The supported high-definition audio CODECs include the following:

• Realtek ALC260/262/880/882/883/885/888

• IDT/Sigmatel STAC9200(D)

• Analog Devices AD1986/1988