[PATCH] efivars: remove from arch/ia64

[PATCH] efivars: remove from arch/ia64

From: Matt Tolentino <metolent@snoqualmie.dp.intel.com>

I broke up the efivars driver update patch I had sent out quite a while ago
into several smaller patches.  This includes several fixes and suggestions
that were pointed out.  The patches are broken down as follows:

1 - remove all traces of efivars from arch/ia64/
2 - add new sysfs based efivars driver into
    drivers/firmware with accompanying Kconfig/Makefile
    changes to make it fully functional for ia64 again.
3 - cleans up x86 references to the /proc version of
    the efivars driver.