x86/intel_rdt: Separate the ctrl bits from rmdir

x86/intel_rdt: Separate the ctrl bits from rmdir

Re-factor the code to separate the ctrl group removal from the rmdir to
prepare to add RDT monitoring group removal.

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: ravi.v.shankar@intel.com
Cc: tony.luck@intel.com
Cc: fenghua.yu@intel.com
Cc: peterz@infradead.org
Cc: eranian@google.com
Cc: vikas.shivappa@intel.com
Cc: ak@linux.intel.com
Cc: davidcc@google.com
Cc: reinette.chatre@intel.com
Link: http://lkml.kernel.org/r/1501017287-28083-21-git-send-email-vikas.shivappa@linux.intel.com