ARM: 8916/1: mm: make set_section_perms() static

The set_section_perms() is not defined outside of the
init.c file, so make it static to avoid the following
warning:

arch/arm/mm/init.c:596:6: warning: symbol 'set_section_perms' was not declared. Should it be static?
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

arch/arm/mm/init.c

@@ -593,7 +593,7 @@ static inline bool arch_has_strict_perms(void)
 	return !!(get_cr() & CR_XP);
 }
 
-void set_section_perms(struct section_perm *perms, int n, bool set,
+static void set_section_perms(struct section_perm *perms, int n, bool set,
 			      struct mm_struct *mm)
 {
 	size_t i;