drm/xe: Fix kunit integration due to missing prototypes

In order to avoid  -Werror=missing-prototypes, add the prototypes
in a separate tests/<test-name>_test.h file that is included by both
the implementation (tests/xe_<testname>.c, injected in xe.ko) and the
kunit module (tests/xe_<testname>_test.c -> xe-<testname>-test.ko).

v2: Add header and don't add ifdef to files that are already not built
when not using kunit (Matt Auld)

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/tests/xe_migrate.c

@@ -5,6 +5,8 @@
 
 #include <kunit/test.h>
 
+#include "tests/xe_migrate_test.h"
+
 #include "xe_pci.h"
 
 static bool sanity_fence_failed(struct xe_device *xe, struct dma_fence *fence,