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This patch implements the `get_target_pwr_state` handler for Tegra186
SoCs. The SoC port uses this handler to find out the cluster/system
state during CPU_SUSPEND, CPU_OFF and SYSTEM_SUSPEND calls.

The MCE firmware controls the power state of the CPU/CLuster/System,
so we query it to get the state and act accordingly.

Change-Id: I86633d8d79aec7dcb405d2301ac69910f93110fe
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>