powerpc/Makefiles: Change to new flag variables
Replace EXTRA_CFLAGS with ccflags-y and EXTRA_AFLAGS with asflags-y.
Signed-off-by: matt mooney <mfm@muteddisk.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
authored by matt mooney and committed by Benjamin Herrenschmidt 4108d9ba fc15351d