[PARISC] Add asm-parisc/mckinley.h bus header

Add header for McKinley bus related code. Remove extern decl
of proc_mckinley_root in drivers/parisc/sba_iommu.c
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

drivers/parisc/sba_iommu.c

@@ -38,15 +38,12 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 
+#include <asm/mckinley.h>	/* for proc_mckinley_root */
 #include <asm/runway.h>		/* for proc_runway_root */
 #include <asm/pdc.h>		/* for PDC_MODEL_* */
 #include <asm/pdcpat.h>		/* for is_pdc_pat() */
 #include <asm/parisc-device.h>
 
-
-/* declared in arch/parisc/kernel/setup.c */
-extern struct proc_dir_entry * proc_mckinley_root;
-
 #define MODULE_NAME "SBA"
 
 #ifdef CONFIG_PROC_FS

include/asm-parisc/mckinley.h

+#ifndef ASM_PARISC_MCKINLEY_H
+#define ASM_PARISC_MCKINLEY_H
+#ifdef __KERNEL__
+
+/* declared in arch/parisc/kernel/setup.c */
+extern struct proc_dir_entry * proc_mckinley_root;
+
+#endif /*__KERNEL__*/
+#endif /*ASM_PARISC_MCKINLEY_H*/