Remove "deprecated" comment next to PROC_PCIE_REFCLOCK_ENABLE attr
Remove "deprecated" comment next to PROC_PCIE_REFCLOCK_ENABLE attr

For some reason this was marked as deprecated at one time but it is
still required.

Change-Id: Ife25d8538690a64b36ef35e60236b30fd792f513
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/34894
Reviewed-by: Martin Gloff <df0a4963746ae04ab678d064fccc7ee68adfd751@us.ibm.com>
Tested-by: Jenkins Server <8e3f934e4c44875bc48d33da3ea13d93ba9a233f@us.ibm.com>
Tested-by: FSP CI Jenkins <aa9e4d9ac7cd25905e9c0dd36d4150516e73dd86@us.ibm.com>
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>

Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot