Staging: w35und: Rename wbhal_s.h to wbhal.h

This patch renames the wbhal_s.h header file to wbhal.h now that it contains
both structure and function definitions.

Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>