qcacmn: Fix key index extraction for mesh rx stats
Fixed key index extraction in hal api to get correct key index from
key id octet.
Change-Id: I342c05260b17c5baba868223e1b6e75d995823aa
CRs-Fixed: 2073737
Venkateswara Swamy Bandaru%!s(int64=7) %!d(string=hai) anos