powerpc: Merge in 64-bit powermac support.

This brings in a lot of changes from arch/ppc64/kernel/pmac_*.c to
arch/powerpc/platforms/powermac/*.c and makes various minor tweaks
elsewhere.  On the powermac we now initialize ppc_md by copying
the whole pmac_md structure into it, which required some changes in
the ordering of initializations of individual fields of it.

Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/powermac/Makefile b/arch/powerpc/platforms/powermac/Makefile
index 74712ed..4369676 100644
--- a/arch/powerpc/platforms/powermac/Makefile
+++ b/arch/powerpc/platforms/powermac/Makefile
@@ -1,8 +1,8 @@
-obj-$(CONFIG_PPC_PMAC)		+= pic.o setup.o time.o feature.o pci.o \
+obj-y				+= pic.o setup.o time.o feature.o pci.o \
 				   sleep.o low_i2c.o cache.o
 obj-$(CONFIG_PMAC_BACKLIGHT)	+= backlight.o
 obj-$(CONFIG_CPU_FREQ_PMAC)	+= cpufreq.o
-ifeq ($(CONFIG_PPC_PMAC),y)
 obj-$(CONFIG_NVRAM)		+= nvram.o
+# ppc64 pmac doesn't define CONFIG_NVRAM but needs nvram stuff
+obj-$(CONFIG_PPC64)		+= nvram.o
 obj-$(CONFIG_SMP)		+= smp.o
-endif