cnss2: relax size restriction on QDSS trace save indication

Relax size restriction on QDSS trace save indication as it is hard
for WLAN FW to get the precise total size.

CRs-Fixed: 2419412
Change-Id: I0b4c2b081fcdcf655332c31e5b257602b3619e31
Signed-off-by: Yuanyuan Liu <yuanliu@codeaurora.org>