sound fixes for 4.15-rc1 All commits found here are small fixes for regression or stable: - PCM timestamp behavior fix that could be seen as a regression - Remove spurious WARN_ON() from ALSA timer 32bit compat ioctl - HD-audio HDMI/DP channel mapping fix for 32bit archs - Fix the previous fix for HD-audio initialization code - More hardening USB-audio against malicious USB descriptors - HD-audio quirks/fixes (Realtek codec, AMD controller) - Missing help text for the recent Intel SST kconfig change