sh: Move over sh64 switch_to and stack unwinder.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh5/Makefile

@@ -1 +1,3 @@
-obj-y := entry.o
+obj-y := entry.o switchto.o
+
+obj-$(CONFIG_KALLSYMS)		+= unwind.o