[ARM] Kirkwood: Remove code duplication in QNAP setup files

Remove the code duplication found in the setup files of TS-219 and
TS-41x.

Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
diff --git a/arch/arm/mach-kirkwood/tsx1x-common.h b/arch/arm/mach-kirkwood/tsx1x-common.h
new file mode 100644
index 0000000..9a59296
--- /dev/null
+++ b/arch/arm/mach-kirkwood/tsx1x-common.h
@@ -0,0 +1,7 @@
+#ifndef __ARCH_KIRKWOOD_TSX1X_COMMON_H
+#define __ARCH_KIRKWOOD_TSX1X_COMMON_H
+
+extern void qnap_tsx1x_register_flash(void);
+extern void qnap_tsx1x_power_off(void);
+
+#endif