drm/imx/dcss: Allow build with COMPILE_TEST=y

Allow imx/dcss to be built with COMPILE_TEST=y for greater
coverage. Builds fine on x86/x86_64 at least.

Cc: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241003111851.10453-8-ville.syrjala@linux.intel.com
Reviewed-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>

drivers/gpu/drm/imx/dcss/Kconfig

@@ -7,7 +7,7 @@ config DRM_IMX_DCSS
 	select DRM_BRIDGE_CONNECTOR
 	select DRM_GEM_DMA_HELPER
 	select VIDEOMODE_HELPERS
-	depends on DRM && ARCH_MXC && ARM64
+	depends on DRM && ((ARCH_MXC && ARM64) || COMPILE_TEST)
 	help
 	  Choose this if you have a NXP i.MX8MQ based system and want to use the
 	  Display Controller Subsystem. This option enables DCSS support.