Revert "irqchip/gic-v2: implement suspend and resume"

This reverts commit fc8e11b2.
With this change present interrupt miss issue was seen even
when irq was defined with no suspend flag.

While at this do not remove the gic_show_resume_irq() that helps
to print the IRQ wake up reason.

Change-Id: I90903f6beeda2e9cdee8cf552e98248c84aa88e0
Signed-off-by: Maulik Shah <quic_mkshah@quicinc.com>