irq-chip: gic-v3: remove print message in irq driver

Remove dmesg about irq redistributor since it fills up
the console with every hotplug of the cpus. The information
about redistributor is already disclosed in the dmesg during
bootup.

CRs-Fixed: 1048941
Change-Id: I5ddb2036ab3df4715382368c144365d578ce4bb8
Signed-off-by: Runmin Wang <runminw@codeaurora.org>
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>