This updates Skylake audio dsp firmware, this version contains update to
support setting of multiple coefficients with one large IPC.

The version of this firmware release is 8.20.00.958.

The md5sum of this firmware binary is 02bd300f5ef85ae04afffd7c0ef50c46.
Signed-off-by: Vinod Koul <vinod.koul@intel.com>