qcacmn: Update missing ie pointers in util_scan_copy_beacon_data

util_scan_copy_beacon_data copies beacon and updates ie
pointers for the cache entry. However, two of the ie pointers
listed below are not updated:
 1) hecap_6g - pointer to he 6ghz cap ie.
 2) srp - pointer to spatial reuse parameter sub extended ie.

These non updated pointers will cause use after free issues
if the parent scan entry is freed.

Update ie pointers for hecap_6g and srp.

Change-Id: I6d0a6129941e3dc1267404a4191ab368c013a102
CRs-Fixed: 2862607