staging: wfx: rename wfx_do_unjoin() into wfx_reset()

In fact, wfx_do_unjoin() resets the interface. This mechanism can be
used in more cases than just disassociating from a BSS. So, rename it to
reflect that fact.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200515083325.378539-12-Jerome.Pouiller@silabs.com


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