configs: keystone2: Do not include hardware.h

This is a hacky way to have this file included in all source files that
include common.h, instead just include from the files that need it.

Signed-off-by: Andrew Davis <afd@ti.com>
diff --git a/drivers/memory/ti-aemif.c b/drivers/memory/ti-aemif.c
index c4bc88c..41325eb 100644
--- a/drivers/memory/ti-aemif.c
+++ b/drivers/memory/ti-aemif.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <asm/arch/hardware.h>
 #include <asm/ti-common/ti-aemif.h>
 
 #define AEMIF_WAITCYCLE_CONFIG		(KS2_AEMIF_CNTRL_BASE + 0x4)