staging: rtl8188eu: use IW_HANDLER to declare wext handlers

Use the IW_HANDLER macro to declare the handler functions for
wext ioctls.  We don't have to skip unused ioctl numbers manually.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210529121346.8422-1-martin@kaiser.cx


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