arm: tegra12: soctherm: change oc1 interrupt print message

arm: tegra12: soctherm: change oc1 interrupt print message

TN8/P1761 enables OC1 throttling with interrupts enabled. Therefore
change pr_warn() message of OC1 interrupt to pr_debug() message. Also
return successfully from interrupt handler.

Bug 1444676

Change-Id: Ic210162259df5880e0e537fdebfcc2bb9a799bd5
Signed-off-by: Timo Alho <talho@nvidia.com>
Reviewed-on: http://git-master/r/360426
(cherry picked from commit d7ed0dd7b83bf507589c7622129dbbac118b931e)
Reviewed-on: http://git-master/r/359945
Reviewed-by: Juha Tukkinen <jtukkinen@nvidia.com>