platsmp: Print the pending irqs in case of hotplug failure

Print the enabled and pending interrupt to help investigate cpu
hotplug failure.

CRs-fixed: 675717
Change-Id: Ib85302ed84ed6e6bdb6bfac593021da9eb790330
Signed-off-by: Archana Sathyakumar <asathyak@codeaurora.org>