sh64: Ensure KALLSYMS is enabled for unwinder use.

Since sh64 depends on kallsyms unconditionally for its stack unwinding to
be of any use, make sure it's selected. In practice we don't have any
case where it's disabled anyways, so moving to this to a select is fine.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 3e723aa..931310b 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -55,6 +55,7 @@
 
 config SUPERH64
 	def_bool ARCH = "sh64"
+	select KALLSYMS
 
 config ARCH_DEFCONFIG
 	string