[PATCH] Remove _machine macro

The _machine macro was once used for compatibility with ARCH=ppc
drivers.  It is unused in current kernels, so remove it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>