drm/imx/dcss: i.MX8MQ DCSS select DRM_GEM_CMA_HELPER

Without DRM_GEM_CMA_HELPER i.MX8MQ DCSS won't build. This needs to be
there.
Signed-off-by: Rudi Heitbaum <rudi@heitbaum.com>
Reviewed-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220216212228.1217831-1-rudi@heitbaum.com

drivers/gpu/drm/imx/dcss/Kconfig

@@ -2,6 +2,7 @@ config DRM_IMX_DCSS
 	tristate "i.MX8MQ DCSS"
 	select IMX_IRQSTEER
 	select DRM_KMS_HELPER
+	select DRM_GEM_CMA_HELPER
 	select VIDEOMODE_HELPERS
 	depends on DRM && ARCH_MXC && ARM64
 	help