microblaze: Don't mark arch_kgdb_ops as const.

Other architectures don't do it, and it conflicts with the extern'd definition
in include/linux/kgdb.h.

The patch fails checkpatch but it reflects current
functions declaration and solved compilation error.
Signed-off-by: Graeme Smecher <gsmecher@threespeedlogic.com>
CC: Michal Simek <monstr@monstr.eu>
CC: linux-kernel@vger.kernel.org
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/microblaze/kernel/kgdb.c

@@ -141,7 +141,7 @@ void kgdb_arch_exit(void)
 /*
  * Global data
  */
-const struct kgdb_arch arch_kgdb_ops = {
+struct kgdb_arch arch_kgdb_ops = {
 #ifdef __MICROBLAZEEL__
 	.gdb_bpt_instr = {0x18, 0x00, 0x0c, 0xba}, /* brki r16, 0x18 */
 #else