staging: wfx: add proper "compatible" string

Add "compatible" string matching "vendor,chip" template and proper
GPIO flags handling. Keep support for old name and reset polarity
for older devicetrees.

Cc: stable@vger.kernel.org   # d3a5bcb4 ("gpio: add gpiod_toggle_active_low()")
Cc: stable@vger.kernel.org
Fixes: 0096214a ("staging: wfx: add support for I/O access")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Link: https://lore.kernel.org/r/0e6dda06f145676861860f073a53dc95987c7ab5.1581416843.git.mirq-linux@rere.qmqm.pl


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