Remove duplicate arch/arm.h include in linux-arm-low.c.

A duplicate include arm/arm.h was introduced, remove it.
Pushed as obvious.

gdb/gdbserver/ChangeLog:

	* linux-arm-low.c: Remove duplicate arch/arm.h include.

gdb/gdbserver/ChangeLog

@@ -1,3 +1,7 @@
+2015-12-03  Antoine Tremblay  <antoine.tremblay@ericsson.com>
+
+	* linux-arm-low.c: Remove duplicate arch/arm.h include.
+
 2015-11-30  Antoine Tremblay  <antoine.tremblay@ericsson.com>
 
 	* linux-arm-low.c (arm_reinsert_addr): Remove function.

gdb/gdbserver/linux-arm-low.c

@@ -30,8 +30,6 @@
 #include "nat/gdb_ptrace.h"
 #include <signal.h>
 
-#include "arch/arm.h"
-
 /* Defined in auto-generated files.  */
 void init_registers_arm (void);
 extern const struct target_desc *tdesc_arm;