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Add support for IDLE_SNAP RPC sent from PMU. This RPC event is received when ELPG is engaged and some register, which lies in powergated region, is accessed for read/write. This RPC sends information like reason for idle_snap and cached value of idle status registers. JIRA NVGPU-7327 Change-Id: I289505c43f0d4246ee1379804b575cd8902050d3 Signed-off-by: Divya <dsinghatwari@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2642951 Reviewed-by: Sagar Kamble <skamble@nvidia.com> Reviewed-by: svcacv <svcacv@nvidia.com> Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit