wlan: Update last_scan_reject_timestamp with proper value

When the scan is rejected, driver saves the scan reject reason and the
rejected time by converting the jiffies to msec. In case when
HZ is 100 while converting jiffies to msec, jiffies_to_msecs() return
wrapped value of jiffies(in msec). This result value of the current jiffies
(return value of jiffies_to_msecs API) becomes greater than scan reject
time (pHddCtx->last_scan_reject_timestamp) and __wlan_hdd_cfg80211_scan
trigger SSR in case of scan rejection.

Fix is to Use jiffiy directly instead of using jiffies_to_msecs()
while updating scan reject time(pHddCtx->last_scan_reject_timestamp).

Change-Id: Ib86830456fdc48143bf282779216ab94aed11923
CRs-Fixed: 2285287