Don't reallocate scanout buffer when we can flip
Don't reallocate scanout buffer when we can flip

We don't have enough memory for three fullscreen scanout buffers
and we know that all buffers are scanout anyway, so don't bother
with this for now.

OtherCrashOverride/armsoc-hardkernel,singulared/xf86-video-armsoc,sbambrough/xf86-video-armsoc,mdrjr/xf86-video-armsoc,xin3liang/xf86-video-armsoc,apxii/xf86-video-armsoc,freedesktop-unofficial-mirror/xorg__driver__xf86-video-armsoc,sbambrough/xf86-video-armsoc,freedesktop-unofficial-mirror/xorg__driver__xf86-video-armsoc,xin3liang/xf86-video-armsoc,mdrjr/xf86-video-armsoc,commshare/xf86-video-armsoc,markyzq/armsoc-rockchip,markyzq/armsoc-rockchip,commshare/xf86-video-armsoc,singulared/xf86-video-armsoc,Popolon/xf86-video-armsoc,mmind/xf86-video-armsoc,OtherCrashOverride/armsoc-hardkernel,apxii/xf86-video-armsoc,Popolon/xf86-video-armsoc,mmind/xf86-video-armsoc