staging: r8188eu: use ieee80211_get_SA

Use ieee80211_get_SA in update_recvframe_phyinfo_88e instead of the
driver-specific get_sa function.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20221031205412.124871-4-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>