Fix IPC timeout issue on APL&CNL#13
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DSP only processes one IPC msg at one time, so driver should do as it required. If two IPC msgs are sent to DSP at the same time, IPC timeout. Now check is_dsp_ready at the IPC sent time to comply with the rule.
Also Refine the is_dsp_ready function, check both BUSY bit and DONE bit. To make sure the last IPC msg is not overwriten, DONE bit is set in reply_done function which is called at the end of msg processing function.