staging: rtl8723bs: replace HT_CAP_AMPDU_FACTOR

Replace unique HT_CAP_AMPDU_FACTOR enum with kernel provided
ieee80211_max_ampdu_length_exp enum.

Signed-off-by: Ross Schmidt <ross.schm.dev@gmail.com>
Link: https://lore.kernel.org/r/20201206034517.4276-4-ross.schm.dev@gmail.com


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