staging: wfx: fix wrong bytes order

The field wakeup_period_max from struct hif_mib_beacon_wake_up_period is
a u8. So, assigning it a __le16 produces a nasty bug on big-endian
architectures.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200512150414.267198-5-Jerome.Pouiller@silabs.com


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