staging: wfx: change variable name to be consistent

Change variable name to be consistent with the naming conventions.
ssidlen was changed to ssid_len and ssidie was changed to ssid_ie to be
consistent. This makes the variables more readable. The other ssid
names in the code are separated by an underscore. For example,
bssid_filter and num_of_ssids have the ssid separated from the rest of
the words with an underscore.

Signed-off-by: Jaehee Park <jhpark1013@gmail.com>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20220401145350.GA45053@jaehee-ThinkPad-X1-Extreme


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