cfg80211: set bss expire time value to that of upstream.

The value of bss expire timer was changed from the
one in upstream kernel. This reduced value creates
issues where the bss results would get expired before
the scan request is accomplished. Hence , this commit
aims to configure the bss expire time as the one in
upstream kernel.

CRs-Fixed: 2369844
Change-Id: I8b57fba12f0d42fa7d01243210206d432fbf9757
Signed-off-by: Sandeep Singh <sandsing@codeaurora.org>