staging: wfx: do not try to save call to hif_set_pm()

Current code try to not exchange data with device if it is not
necessary. However, it seems that the additional code does not provide
any gain. So, we prefer to keep a simpler code.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20191217161318.31402-36-Jerome.Pouiller@silabs.com


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