ci: Unify on MESA_VK_IGNORE_CONFORMANCE_WARNING

Move and rename warn_non_conformant_implementation() to common location
of src/vulkan/util/vk_util.c as vk_warn_non_conformant_implementation().

In freedreno/ci,  move MESA_VK_IGNORE_CONFORMANCE_WARNING to common
location of .baremetal-deqp-test-freedreno-vk.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11563>

src/vulkan/util/vk_util.c

@@ -23,9 +23,11 @@
  * IN THE SOFTWARE.
  */
 
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include "vk_util.h"
+#include "util/debug.h"
 
 uint32_t vk_get_driver_version(void)
 {
@@ -67,3 +69,13 @@ uint32_t vk_get_version_override(void)
 
    return VK_MAKE_VERSION(major, minor, patch);
 }
+
+void
+vk_warn_non_conformant_implementation(const char *driver_name)
+{
+   if (env_var_as_boolean("MESA_VK_IGNORE_CONFORMANCE_WARNING", false))
+      return;
+
+   fprintf(stderr, "WARNING: %s is not a conformant Vulkan implementation, "
+                   "testing use only.\n", driver_name);
+}

src/vulkan/util/vk_util.h

@@ -223,6 +223,8 @@ uint32_t vk_get_driver_version(void);
 
 uint32_t vk_get_version_override(void);
 
+void vk_warn_non_conformant_implementation(const char *driver_name);
+
 struct vk_pipeline_cache_header {
    uint32_t header_size;
    uint32_t header_version;