dsp: q6asm: Add check for ADSP payload size

There is no check for the ADSP returned payload size
for ASM_SESSION_CMD_GET_MTMX_STRTR_PARAMS_V2 cmd response.
This can lead to buffer overread. Fix is to address this.

Change-Id: I0bd6ee7f19823addc5dde1dfbb32b8a9b102a725
Signed-off-by: Sairam <Peri&lt;quic_peri@quicinc.com>