Merge tag 'v4.9-rc4' into sound

Bring in -rc4 patches so I can successfully merge the sound doc changes.

diff --cc Documentation/device-mapper/dm-raid.txt
Simple merge

diff --cc Documentation/networking/netdev-FAQ.txt
Simple merge

diff --cc MAINTAINERS
Simple merge

diff --cc drivers/nvdimm/Kconfig
Simple merge

diff --cc lib/Kconfig.debug
Simple merge