spmi: pmic_arb: add a print in cleanup_irq

The cleanup_irq() was meant to clear and mask interrupts that were
left enabled in the hardware but there was no interrupt handler
registered for it. Add an error print when it gets invoked.

Change-Id: Iccf0daadeb82b0fca29829424439ac225e2b3b88
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: David Collins <collinsd@codeaurora.org>