panfrost: Texture from Z32F_S8 as R32F

Z32F_S8 becomes Z32F in texturing, which in turn just becomes R32F.

Fixes dEQP-GLES3.functional.texture.format.sized.*.depth32f_stencil8*

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>

src/gallium/drivers/panfrost/pan_format.c

@@ -185,6 +185,10 @@ panfrost_find_format(const struct util_format_description *desc) {
         case PIPE_FORMAT_Z24_UNORM_S8_UINT:
                 return MALI_Z32_UNORM;
 
+        case PIPE_FORMAT_Z32_FLOAT_S8X24_UINT:
+                /* Z32F = R32F to the hardware */
+                return MALI_R32F;
+
         case PIPE_FORMAT_B5G6R5_UNORM:
                 return MALI_RGB565;