Revert "asoc: check payload length against structure size"

This reverts commit 2f35e4997c3e78a83fcdc459f4dcbbbaddc85d2d.
Payload size is specified in ASM callback,
which allocates memory consequently.
The check was unnecessary and incorrect.

Change-Id: I130870148db9c31a885b86f7ea495a8e843958d8