audio effects: rename configure command

Renamed audio effect library interface command for audio format
configuration from EFFECT_CMD_CONFIGURE to EFFECT_CMD_SET_CONFIG.
This makes the naming more consistent with other exixsting commands
and allow adding a new command to get the configuration (EFFECT_CMD_GET_CONFIG).
Same change for reverse channel configuration renamed from
EFFECT_CMD_CONFIGURE_REVERSE to EFFECT_CMD_SET_CONFIG_REVERSE.

Implemented EFFECT_CMD_GET_CONFIG in exisitng effect libraries.

Change-Id: Ia7b1c620f13797fe5aceb3b0b4acbacce09fb067