staging: rtl8723bs: replace RTW_GET_BE16 with get_unaligned_be16

Replace RTW_GET_BE16 macro with get_unlaligned_be16.

Signed-off-by: Ross Schmidt <ross.schm.dev@gmail.com>
Link: https://lore.kernel.org/r/20201004011743.10750-7-ross.schm.dev@gmail.com


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