Staging: w35und: clean up wblinux.c a bit

This patch removes wrapper functions from wblinux.c and moves the hardware init
and halt functions to wbusb.c which has the only callers of them.

Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>