board/BuR: split bur_am335x_common.h into am335x-specific and BuR common parts

bur_am335x_common.h today holds all common configuration which is shared
over all B&R boards.

In future we want to bring up boards which are not based on AM335x only
but we still want to have common configuration over all B&R boards
independent from their architecture.

To prepare this we introduce a new file "bur_cfg_common.h", where we
move all common things, which are not architecture specific, from
bur_am335x_common.h.

On B&R am335x boards we include from now:

#include <configs/bur_cfg_common.h>
#include <configs/bur_am335x_common.h>

On other B&R boards, we include only
#include <configs/bur_cfg_common.h>

Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/kwb.h b/include/configs/kwb.h
index e570c71..b39bcfa 100644
--- a/include/configs/kwb.h
+++ b/include/configs/kwb.h
@@ -12,6 +12,7 @@
 #ifndef __CONFIG_KWB_H__
 #define __CONFIG_KWB_H__
 
+#include <configs/bur_cfg_common.h>
 #include <configs/bur_am335x_common.h>
 /* ------------------------------------------------------------------------- */
 #define CONFIG_AM335X_LCD
@@ -27,6 +28,9 @@
 #define CONFIG_BMP_24BMP
 #define CONFIG_BMP_32BPP
 
+/* memory */
+#define CONFIG_SYS_MALLOC_LEN		(5 * 1024 * 1024)
+
 /* Clock Defines */
 #define V_OSCK				26000000  /* Clock output from T2 */
 #define V_SCLK				(V_OSCK)