metag: remove SET_PERSONALITY()

Commit e72837e3 ("default
SET_PERSONALITY() in linux/elf.h").

The above commit moved the common definition of SET_PERSONALITY() in a
bunch of the arch headers to linux/elf.h. Metag shares that common
definition so remove it from arch/metag/include/asm/elf.h too.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

arch/metag/include/asm/elf.h

@@ -100,9 +100,6 @@ typedef unsigned long elf_fpregset_t;
 
 #define ELF_PLATFORM  (NULL)
 
-#define SET_PERSONALITY(ex) \
-	set_personality(PER_LINUX | (current->personality & (~PER_MASK)))
-
 #define STACK_RND_MASK (0)
 
 #ifdef CONFIG_METAG_USER_TCM