dracut-module-setup: Fix test for inclusion of DRM modules

The /sys/modules/*/drivers sysfs entries do not exist anymore on newer
kernels which means that the DRM moduels would never be included.
Instead check if there is any device with a "drm" sysfs directory to
decide on whether DRM modules need to be included.

Acked-by: Dave Young <dyoung@redhat.com>

dracut-module-setup.sh

@@ -20,7 +20,7 @@ check() {
 depends() {
     local _dep="base shutdown"
 
-    if [ -d /sys/module/drm/drivers ]; then
+    if [ -n "$( find /sys/devices -name drm )" ]; then
         _dep="$_dep drm"
     fi