etnaviv: fix late Z with MSAA active

etnaviv: fix late Z with MSAA active

On RA_WRITE_DEPTH GPUs the RA stage needs to be told that MSAA is active
when the PE Z/S stage is needed. Not sure what it does exactly, but this
fixes broken late Z on those GPUs when performing MSAA rendering.

Cc: 22.3 mesa-stable
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19571>
(cherry picked from commit 2f85d9095e3559597bc1cf0051ab6d7bc18faecd)