[automerger] Add EFFECT_CMD_SET_PARAM parameter checking to Downmix and Reverb...

[automerger] Add EFFECT_CMD_SET_PARAM parameter checking to Downmix and Reverb am: 804632af am: bc1d023c am: 03c1ecd9 am: c4b06bbc am: 5c6acee1 am: fcc98fa3 am: 1f2d8b0b am: 698581c5 am: e52a6ab8 am: c6905d1c am: fe49081e am: 716c720b am: 8883fd48 am: f05b30c2 am: de39832e
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Change-Id: If6f3c2af42d5314a9a96e41f4530010f8bec5196