Add missing header files

This is in preparation of switching to autotools, add explicit #includes
for header files where there was an implicit dependency.

Signed-off-by: Allen Martin <amartin@nvidia.com>
Change-Id: I8ca5832638ac7043f2b4e687c52bbe6e0a755eef
Reviewed-on: http://git-master/r/217546
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>

src/cbootimage.c

@@ -21,6 +21,7 @@
  * cbootimage.c - Implementation of the cbootimage tool.
  */
 
+#include <strings.h>
 #include "cbootimage.h"
 #include "crypto.h"
 #include "data_layout.h"

src/cbootimage.h

@@ -24,6 +24,7 @@
 #ifndef INCLUDED_BUILDIMAGE_H
 #define INCLUDED_BUILDIMAGE_H
 
+#include <sys/types.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>