nios2: move nios2.h to arch asm directory

The nios2.h is nios2 cpu specific, and should go arch asm
directory.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>

arch/nios2/cpu/cpu.c

@@ -6,7 +6,7 @@
  */
 
 #include <common.h>
-#include <nios2.h>
+#include <asm/nios2.h>
 #include <asm/cache.h>
 
 DECLARE_GLOBAL_DATA_PTR;

arch/nios2/cpu/interrupts.c

@@ -9,7 +9,7 @@
  */
 
 
-#include <nios2.h>
+#include <asm/nios2.h>
 #include <asm/types.h>
 #include <asm/io.h>
 #include <asm/ptrace.h>

include/nios2.h → arch/nios2/include/asm/nios2.h

@@ -5,8 +5,8 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
-#ifndef __NIOS2_H__
-#define __NIOS2_H__
+#ifndef __ASM_NIOS2_H__
+#define __ASM_NIOS2_H__
 
 /*------------------------------------------------------------------------
  * Control registers -- use with wrctl() & rdctl()
@@ -37,4 +37,4 @@
 #define CACHE_BYPASS(a) ((a) | 0x80000000)
 #define CACHE_NO_BYPASS(a) ((a) & ~0x80000000)
 
-#endif /* __NIOS2_H__ */
+#endif /* __ASM_NIOS2_H__ */