radv: bind the pre-compiled PS epilog to the cmdbuf state

radv: bind the pre-compiled PS epilog to the cmdbuf state

For PS epilogs we have two paths, the first one is to pre-compile PS
epilogs at pipeline creation time, while the second one is to compile
PS epilogs on-demand when some dynamic states are used.

Binding the pre-compiled PS epilog to the cmdbuf state allows us to
remove one more pipeline dependency when recording cmdbufs (for shader
objects).

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24254>