sparc: introduce arch/sparc/Kbuild

This allows us to do:

    make arch/sparc/

to build the core part of the sparc kernel.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/Kbuild b/arch/sparc/Kbuild
new file mode 100644
index 0000000..27b540d
--- /dev/null
+++ b/arch/sparc/Kbuild
@@ -0,0 +1,7 @@
+#
+# core part of the sparc kernel
+#
+
+obj-y += kernel/
+obj-y += mm/
+obj-y += math-emu/