[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

Change-Id: I6dc4e6371c446044513524a294ed269b5bf1d5be