drm/i915: Fix selecting CONFIG_DRM_KUNIT_TEST in debug builds

Selecting an option which depends on other options only works if the
dependencies are guaranteed to be selected (as these dependencies will
not be automatically selected). CONFIG_DRM_KUNIT_TEST depends on DRM,
MMU and KUNIT the first two of which are guaranteed to be selected for
i915, but the last one is not. Hence, selecting CONFIG_DRM_KUNIT_TEST in
i915 debug builds may result in CONFIG_DRM_KUNIT_TEST being selected
without the CONFIG_KUNIT dependency being selected. This causes at least
the following compile error:

drivers/gpu/drm/tests/drm_bridge_test.c: In function ‘drm_test_bridge_alloc_init’:
drivers/gpu/drm/tests/drm_bridge_test.c:449:21: error: implicit declaration of function ‘kunit_device_register’; did you mean ‘root_device_register’? [-Werror=implicit-function-declaration]
449 | priv->dev = kunit_device_register(test, "drm-bridge-dev");

Fix the above by selecting CONFIG_DRM_KUNIT_TEST only if CONFIG_KUNIT is
also selected.

Fixes: 17133255a322 ("drm/i915: replace DRM_DEBUG_SELFTEST with DRM_KUNIT_TEST")
Cc: Ruben Wauters <[e-mail]>
Cc: Rodrigo Vivi <[e-mail]>
Reviewed-by: Rodrigo Vivi <[e-mail]>
Signed-off-by: Imre Deak <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/i915/Kconfig.debug

···
 	select DRM_VGEM # used by igt/prime_vgem (dmabuf interop checks)
 	select DRM_DEBUG_MM if DRM=y
 	select DRM_EXPORT_FOR_TESTS if m
-	select DRM_KUNIT_TEST
+	select DRM_KUNIT_TEST if KUNIT
 	select DMABUF_SELFTESTS
 	select SW_SYNC # signaling validation framework (igt/syncobj*)
 	select DRM_I915_WERROR