nitrogen6x: Move setup_sata to common part

Move setup_sata function definition from platform file nitrogen6x.c
to arch/arm/imx-common/sata.c to avoid code duplication.

Signed-off-by: Giuseppe Pagano <giuseppe.pagano@seco.com>
CC: Stefano Babic <sbabic@denx.de>
CC: Fabio Estevam <fabio.estevam@freescale.com>
CC: Eric Nelson <eric.nelson@boundarydevices.com>
diff --git a/arch/arm/include/asm/imx-common/sata.h b/arch/arm/include/asm/imx-common/sata.h
new file mode 100644
index 0000000..6b864cb
--- /dev/null
+++ b/arch/arm/include/asm/imx-common/sata.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __IMX_SATA_H_
+#define __IMX_SATA_H_
+
+/*
+ * SATA setup for i.mx6 quad based platform
+ */
+
+int setup_sata(void);
+
+#endif