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This patch add support for rockchip voice activity detection. The vad is used to detect the amplitude of voice which is received by analog mic, i2s digital mic or pdm digital mic when soc is in low power mode. if the amplitude of voice is over threshold, the vad will assert interrupt to wake up soc, then soc will exit low power mode. Change-Id: Idb7a3adb87ec4c07274eefd82da4672d493c7627 Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>