microblaze: Remove additional headers

There were several changes in past in this file without removing headers
(watchdog cleanup, soft reset, etc). That's why remove additional useless
headers.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/board/xilinx/microblaze-generic/microblaze-generic.c b/board/xilinx/microblaze-generic/microblaze-generic.c
index 30be015..7e784d1 100644
--- a/board/xilinx/microblaze-generic/microblaze-generic.c
+++ b/board/xilinx/microblaze-generic/microblaze-generic.c
@@ -12,15 +12,8 @@
 
 #include <common.h>
 #include <config.h>
-#include <dm.h>
 #include <dm/lists.h>
 #include <fdtdec.h>
-#include <asm/processor.h>
-#include <asm/microblaze_intc.h>
-#include <asm/asm.h>
-#include <asm/gpio.h>
-#include <dm/uclass.h>
-#include <wdt.h>
 #include <linux/sizes.h>
 
 DECLARE_GLOBAL_DATA_PTR;