UPSTREAM: cfg80211: save multi-bssid properties

When the new IEs are generated, the multiple BSSID elements
are not saved. Save aside properties that are needed later
for PS.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry picked from commit 0cd01efb03396c5368b1a32eed0ccb2aa453bdc8)
Bug: 154523213
Signed-off-by: Connor O'Brien <connoro@google.com>
Change-Id: I5011217119bfc01dcd2d3aa10f37df4dc385b5c0