intel/fs: fix depth compute state for unchanged depth layout

intel/fs: fix depth compute state for unchanged depth layout

There is no VK CTS exercising this case. If there was we would run
into hangs as noticed in
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26876

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable
Reviewed-by: Konstantin Seurer <konstantin.seurer@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26923>
(cherry picked from commit 4b30b46ffdbc962f09ef87529a71d78cf514f8d8)