FogBugz #186973: nios2: Fix warning from cacheflush.h

Fixed this warning by adding <linux/mm_types.h> and remove unused
cacheflush.h in process.c.

Example warning message:
arch/nios2/include/asm/cacheflush.h:21:2: warning:
'struct vm_area_struct' declared inside parameter list

Signed-off-by: Ley Foon Tan <[email protected]>

Author: Ley Foon Tan

arch/nios2/include/asm/cacheflush.h

@@ -12,6 +12,8 @@
 #ifndef _ASM_NIOS2_CACHEFLUSH_H
 #define _ASM_NIOS2_CACHEFLUSH_H
 
+#include <linux/mm_types.h>
+
 struct mm_struct;
 
 extern void flush_cache_all(void);

arch/nios2/kernel/process.c

@@ -24,7 +24,6 @@
 
 #include <asm/unistd.h>
 #include <asm/traps.h>
-#include <asm/cacheflush.h>
 #include <asm/cpuinfo.h>
 
 asmlinkage void ret_from_fork(void);