staging: wilc1000: remove wilc_platform.h include file

This patch removes wilc_platform.h include file that is defined in
wilc_msgqueue.h file. After removing it, compilation error occurs so
that it is included two header files as <linux/semaphore.h> and
<linux/slab.h> at wilc_msgqueue.h and wilc_msgqueue.c

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