[git pull] drm regression final fixes

Hi Linus hope you get this before release, if not stable life, the main fix is a major regression on AGP/no-pat systems where pages ended up in uncached, a further fix to the vgaarb fix, and a fix to make rv740 gpus just work for now (they have some tile/backend quirk that AMD haven't tracked

Re: [git pull] drm regression final fixes

Hi Linus hope you get this before release, if not stable life, the main fix is a major regression on AGP/no-pat systems where pages ended up in uncached, a further fix to the vgaarb fix, and a fix to make rv740 gpus just work for now (they have some tile/backend quirk that AMD haven't