More 4.14 work: - tons of corner-case fixes for gpu reset/recovery (Chris Wilson) - refactor power-well code for future platforms (Imre) - Ycbcr420 support for hdmi 2.0 displays (Shashank Sharma) - document FBC structs (Paulo Zanoni) - reduce struct_mutex usage in pinning (Chris Wilson) - small bits all over, as usual