dsp: Remove param_size from pkt_size of apr header

As param_size is included in apr header pkt_size, out of
bounds access occurs in glink. Remove the param size addition
to fix this issue.

CRs-Fixed: 2472208
Change-Id: If8b34aeacd3bc9ba67ac9276eb1a8ebf0933f9f9
Signed-off-by: Aditya Bavanari <abavanar@codeaurora.org>