ARM: tegra: move tegra-ahb.h out of arch/arm/mach-tegra/

We wish to empty arch/arm/mach-tegra/include/mach/ as much as possible
to enable single zImage. Move tegra-ahb.h to a more central location
(suggested by Arnd, OK'd by Greg KH), and actually make tegra-ahb.c
include the header to ensure client and provider agree on the prototype.

Signed-off-by: Stephen Warren <[e-mail]>

arch/arm/mach-tegra/include/mach/tegra-ahb.h include/linux/tegra-ahb.h

···
  * more details.
  */
 
-#ifndef __MACH_TEGRA_AHB_H__
-#define __MACH_TEGRA_AHB_H__
+#ifndef __LINUX_AHB_H__
+#define __LINUX_AHB_H__
 
 extern int tegra_ahb_enable_smmu(struct device_node *ahb);
 
-#endif	/* __MACH_TEGRA_AHB_H__ */
+#endif	/* __LINUX_AHB_H__ */

drivers/amba/tegra-ahb.c

···
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
+#include <linux/tegra-ahb.h>
 
 #define DRV_NAME "tegra-ahb"
 

drivers/iommu/tegra-smmu.c

···
 #include <linux/of_iommu.h>
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
+#include <linux/tegra-ahb.h>
 
 #include <asm/page.h>
 #include <asm/cacheflush.h>
-
-#include <mach/tegra-ahb.h>
 
 enum smmu_hwgrp {
 	HWGRP_AFI,