Staging: wlan-ng: Use standard kernel integer (u32/s32/etc) types.

wlan-ng needed to interact with userspace, and support very old kernels,
so it used to define its own types for integers to ensure consistency.

It's all rather irrelevant now.

Signed-off-by: Solomon Peachy <pizza@shaftnet.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>