Revert "sched: Disable CONFIG_RT_GROUP_SCHED on RT"

The original issue does not reproduce anymore.

Allow RT_GROUP_SCHED to be selected.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

init/Kconfig

@@ -1009,7 +1009,6 @@ config CFS_BANDWIDTH
 config RT_GROUP_SCHED
 	bool "Group scheduling for SCHED_RR/FIFO"
 	depends on CGROUP_SCHED
-	depends on !PREEMPT_RT
 	default n
 	help
 	  This feature lets you explicitly allocate real CPU bandwidth