staging: wilc1000: remove declaration of WILC_WFI_frame_register

staging: wilc1000: remove declaration of WILC_WFI_frame_register

This patch removes function declaration of WILC_WFI_frame_register in
linux_wlan.c file, then adds it in wilc_wfi_cfgoperations.h file.

The compilation warning occurs because it is assigned to incorrect
pointer type of second parameter of WILC_WFI_frame_register.
It is assigned with struct wireless_dev pointer type.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>