[PATCH] ppc32: nvram driver for chrp

This implements a nvram acccess method, similar to
arch/ppc64/kernel/pSeries_nvram.c tested on CHRP B50.

Signed-off-by: Olaf Hering <olh@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>