drm/nvd0/disp: introduce a nvd0_head as a subclass of nouveau_crtc
drm/nvd0/disp: introduce a nvd0_head as a subclass of nouveau_crtc

This will be used instead of storing a heap of per-head data (such as evo
channels) in nvd0_display in some other way.

Signed-off-by: Ben Skeggs <d9f27fb07c1e9f131223ad827fa5179f3846c30b@redhat.com>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas