staging: wfx: keys are kept during whole firmware life

Keys sent to the firmware are never reset. So, it is not necessary to
re-upload them after hif_reset(). Thus, it is no more necessary to keep
a copy of the keys in struct wfx_dev.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200420160311.57323-12-Jerome.Pouiller@silabs.com


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