radv: Remove the skipping of framebuffer emission if we don't have a framebuffer.
This was plain broken. The solution is to not require any framebuffer changes. Silently skipping results in broken behavior. e.g:
(secondary cmdbuffer with no framebuffer) ClearAttachment 2
translated into
bind attachment 2 as attachment 0 (skipped) clear attachment 0 restore original bindings (skipped)
which results in clearing attachment 0, not what we wanted. It is a small wonder CTS doesn't find it until VK_KHR_dynamic_rendering.
Closes: #862 (closed)