ARM: i.MX: provide declaration for board_spi_cs_gpio

Provide a public declaration of the board_spi_cs_gpio()
callback for i.MX SPI chip selects to prevent the warning
"Should it be static?" when compiling with "make C=1".

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>

arch/arm/include/asm/imx-common/spi.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __MXC_SPI_H_
+#define __MXC_SPI_H_
+
+/*
+ * Board-level chip-select callback
+ * Should return GPIO # to be used for chip-select
+ */
+
+int board_spi_cs_gpio(unsigned bus, unsigned cs);
+
+#endif

board/boundary/nitrogen6x/nitrogen6x.c

@@ -18,6 +18,7 @@
 #include <asm/imx-common/iomux-v3.h>
 #include <asm/imx-common/mxc_i2c.h>
 #include <asm/imx-common/sata.h>
+#include <asm/imx-common/spi.h>
 #include <asm/imx-common/boot_mode.h>
 #include <asm/imx-common/video.h>
 #include <mmc.h>

board/compulab/cm_fx6/common.c

@@ -11,6 +11,7 @@
 #include <common.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/gpio.h>
+#include <asm/imx-common/spi.h>
 #include <fsl_esdhc.h>
 #include "common.h"
 

board/embest/mx6boards/mx6boards.c

@@ -23,6 +23,7 @@
 #include <asm/imx-common/iomux-v3.h>
 #include <asm/imx-common/boot_mode.h>
 #include <asm/imx-common/mxc_i2c.h>
+#include <asm/imx-common/spi.h>
 #include <asm/imx-common/video.h>
 #include <i2c.h>
 #include <mmc.h>

board/freescale/mx6qsabreauto/mx6qsabreauto.c

@@ -17,6 +17,7 @@
 #include <asm/imx-common/iomux-v3.h>
 #include <asm/imx-common/mxc_i2c.h>
 #include <asm/imx-common/boot_mode.h>
+#include <asm/imx-common/spi.h>
 #include <mmc.h>
 #include <fsl_esdhc.h>
 #include <miiphy.h>

board/freescale/mx6slevk/mx6slevk.c

@@ -13,6 +13,7 @@
 #include <asm/arch/sys_proto.h>
 #include <asm/gpio.h>
 #include <asm/imx-common/iomux-v3.h>
+#include <asm/imx-common/spi.h>
 #include <asm/io.h>
 #include <linux/sizes.h>
 #include <common.h>

board/gateworks/gw_ventana/gw_ventana.c

@@ -20,6 +20,7 @@
 #include <asm/imx-common/mxc_i2c.h>
 #include <asm/imx-common/boot_mode.h>
 #include <asm/imx-common/sata.h>
+#include <asm/imx-common/spi.h>
 #include <asm/imx-common/video.h>
 #include <jffs2/load_kernel.h>
 #include <hwconfig.h>

board/genesi/mx51_efikamx/efikamx.c

@@ -14,6 +14,7 @@
 #include <asm/arch/sys_proto.h>
 #include <asm/arch/crm_regs.h>
 #include <asm/arch/clock.h>
+#include <asm/imx-common/spi.h>
 #include <i2c.h>
 #include <mmc.h>
 #include <fsl_esdhc.h>

board/ttcontrol/vision2/vision2.c

@@ -15,6 +15,7 @@
 #include <asm/arch/iomux-mx51.h>
 #include <asm/gpio.h>
 #include <asm/arch/sys_proto.h>
+#include <asm/imx-common/spi.h>
 #include <i2c.h>
 #include <mmc.h>
 #include <power/pmic.h>

drivers/spi/mxc_spi.c

@@ -12,6 +12,7 @@
 #include <asm/gpio.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/clock.h>
+#include <asm/imx-common/spi.h>
 
 #ifdef CONFIG_MX27
 /* i.MX27 has a completely wrong register layout and register definitions in the