demo: Remove <common.h> and add needed includes

Remove <common.h> from this driver directory and when needed
add missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>

drivers/demo/demo-pdata.c

@@ -3,7 +3,6 @@
  * Copyright (c) 2013 Google, Inc
  */
 
-#include <common.h>
 #include <dm.h>
 #include <dm-demo.h>
 

drivers/demo/demo-shape.c

@@ -3,7 +3,6 @@
  * Copyright (c) 2013 Google, Inc
  */
 
-#include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>

drivers/demo/demo-simple.c

@@ -6,7 +6,6 @@
  * Pavel Herrmann <morpheus.ibis@gmail.com>
  */
 
-#include <common.h>
 #include <dm.h>
 #include <dm-demo.h>
 #include <mapmem.h>

drivers/demo/demo-uclass.c

@@ -6,7 +6,6 @@
  * Pavel Herrmann <morpheus.ibis@gmail.com>
  */
 
-#include <common.h>
 #include <dm.h>
 #include <dm-demo.h>
 #include <errno.h>