staging: wfx: take advantage of le32_to_cpup()

le32_to_cpu(*x) can be advantageously converted in le32_to_cpup(x).

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200512150414.267198-3-Jerome.Pouiller@silabs.com


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