Staging: w35und: merge wbhal.c to wbusb.c

Impact: cleanup

This patch moves all the functions in wbhal.c that are used only in
wbusb.c to the latter file.

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