dracut: do not install dracut module in non-hostonly by default

In non-hostonly (generic) dracut invocation, only add rdma dracut
module to the generated initramfs if it is explicitly requested.

Signed-off-by: Jo Zzsi <jozzsicsataban@gmail.com>

Author: jozzsi

kernel-boot/dracut/50rdma/module-setup.sh

@@ -3,7 +3,7 @@
 check() {
     [ -n "$hostonly" ] && [ -e /sys/class/infiniband_verbs/uverbs0 ] && return 0
     [ -n "$hostonly" ] && return 255
-    return 0
+    return 255
 }
 
 depends() {