staging: rtl8192e: Remove struct rtllib_pspoll_hdr

Replace struct rtllib_pspoll_hdr with struct ieee80211_pspoll to avoid
proprietary code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/a4bd004fcbba81f96fd09f5adec5f029e2de3d6d.1694792595.git.philipp.g.hortmann@gmail.com


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