Rename include/md5.h to include/u-boot/md5.h

Some systems have md5.h installed in /usr/include/. This isn't the
desired file (we want the one in include/md5.h). This will avoid the
conflict. This fixes the host tools building problem by creating a new
directory for U-Boot specific header files.

[Patch by Andy Fleming, modified to use separate directory by Wolfgang
Denk]

Signed-off-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Andy Fleming <afleming@freescale.com>
Acked-by: Timur Tabi <timur@freescale.com>

common/image.c

@@ -53,7 +53,7 @@
 #endif
 
 #if defined(CONFIG_FIT)
-#include <md5.h>
+#include <u-boot/md5.h>
 #include <sha1.h>
 
 static int fit_check_ramdisk (const void *fit, int os_noffset,
@@ -70,7 +70,7 @@ static image_header_t* image_get_ramdisk (ulong rd_addr, uint8_t arch,
 						int verify);
 #else
 #include "mkimage.h"
-#include <md5.h>
+#include <u-boot/md5.h>
 #include <time.h>
 #include <image.h>
 #endif /* !USE_HOSTCC*/