ac/nir: only change the image dim from 3d -> 2d array on gfx9

10 jobs for !1291 with radv-navi-fix-3d-textures in 9 minutes and 58 seconds (queued for 50 seconds)
latest detached
Status Job ID Name Coverage
  Containers Build
passed #407321
debian

00:00:19

 
  Build+Test
passed #407323
meson-clang

00:04:22

passed #407327
meson-clover

00:08:18

passed #407326
meson-main

00:04:21

passed #407322
meson-swr-glvnd

00:04:28

passed #407328
meson-vulkan

00:02:25

passed #407330
scons-llvm

00:04:56

passed #407329
scons-nollvm

00:02:35

passed #407324
scons-swr

00:07:53

passed #407325
scons-win64

00:05:41