Add "Test" ipc class - #852
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This will be used for stress testing the IPC interface. The first type "IPC_FLOOD" is used for flooding the DSP with test IPC messages to check for failures.
We add a couple of new debugfs entries "ipc_flood_count" and "ipc_flood_duration_ms" that can be used to execute the IPC flood test. "ipc_flood_count" floods the DSP with the number of test IPCs specified and ipc_flood_duration_ms floods the DSP with test IPC's for the duration (in ms)specified. The test stats such as average, min and max IPC response times are logged in the dmesg.