[ARM] Remove needless linux/ptrace.h includes

Lots of places in arch/arm were needlessly including linux/ptrace.h,
resumably because we used to pass a struct pt_regs to interrupt
handlers.  Now that we don't, all these ptrace.h includes are
redundant.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/alignment.c

@@ -15,7 +15,6 @@
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
-#include <linux/ptrace.h>
 #include <linux/proc_fs.h>
 #include <linux/init.h>
 

arch/arm/mm/fault.c

@@ -10,7 +10,6 @@
  */
 #include <linux/module.h>
 #include <linux/signal.h>
-#include <linux/ptrace.h>
 #include <linux/mm.h>
 #include <linux/init.h>
 

arch/arm/mm/init.c

@@ -9,7 +9,6 @@
  */
 #include <linux/kernel.h>
 #include <linux/errno.h>
-#include <linux/ptrace.h>
 #include <linux/swap.h>
 #include <linux/init.h>
 #include <linux/bootmem.h>