hexagon: vm_tlb: include asm/tlbflush.h for prototypes

Clang warns about several missing prototypes that are declared in this
header:

  arch/hexagon/mm/vm_tlb.c:25:6: warning: no previous prototype for function 'flush_tlb_range' [-Wmissing-prototypes]
     25 | void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
        |      ^
  arch/hexagon/mm/vm_tlb.c:25:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     25 | void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
        | ^
        | static
  arch/hexagon/mm/vm_tlb.c:37:6: warning: no previous prototype for function 'flush_tlb_one' [-Wmissing-prototypes]
     37 | void flush_tlb_one(unsigned long vaddr)
        |      ^
  arch/hexagon/mm/vm_tlb.c:37:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     37 | void flush_tlb_one(unsigned long vaddr)
        | ^
        | static
  arch/hexagon/mm/vm_tlb.c:47:6: warning: no previous prototype for function 'tlb_flush_all' [-Wmissing-prototypes]
     47 | void tlb_flush_all(void)
        |      ^
  arch/hexagon/mm/vm_tlb.c:47:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     47 | void tlb_flush_all(void)
        | ^
        | static
  arch/hexagon/mm/vm_tlb.c:56:6: warning: no previous prototype for function 'flush_tlb_mm' [-Wmissing-prototypes]
     56 | void flush_tlb_mm(struct mm_struct *mm)
        |      ^
  arch/hexagon/mm/vm_tlb.c:56:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     56 | void flush_tlb_mm(struct mm_struct *mm)
        | ^
        | static
  arch/hexagon/mm/vm_tlb.c:66:6: warning: no previous prototype for function 'flush_tlb_page' [-Wmissing-prototypes]
     66 | void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr)
        |      ^
  arch/hexagon/mm/vm_tlb.c:66:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     66 | void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr)
        | ^
        | static
  arch/hexagon/mm/vm_tlb.c:78:6: warning: no previous prototype for function 'flush_tlb_kernel_range' [-Wmissing-prototypes]
     78 | void flush_tlb_kernel_range(unsigned long start, unsigned long end)
        |      ^
  arch/hexagon/mm/vm_tlb.c:78:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     78 | void flush_tlb_kernel_range(unsigned long start, unsigned long end)
        | ^
        | static
  6 warnings generated.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Nathan Chancellor <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Brian Cain <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

arch/hexagon/mm/vm_tlb.c

@@ -14,6 +14,7 @@
 #include <linux/sched.h>
 #include <asm/page.h>
 #include <asm/hexagon_vm.h>
+#include <asm/tlbflush.h>
 
 /*
  * Initial VM implementation has only one map active at a time, with