move htonl() + friends to util.h

As the next patch will add one more user of the macros move them
to util.h.  Also add the 16bit variants.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/src/coreboot.c b/src/coreboot.c
index 7fa18e4..3dc6a7f 100644
--- a/src/coreboot.c
+++ b/src/coreboot.c
@@ -351,11 +351,6 @@
  * Coreboot flash format
  ****************************************************************/
 
-// XXX - optimize
-#define ntohl(x) ((((x)&0xff)<<24) | (((x)&0xff00)<<8) | \
-                  (((x)&0xff0000) >> 8) | (((x)&0xff000000) >> 24))
-#define htonl(x) ntohl(x)
-
 #define CBFS_HEADER_MAGIC 0x4F524243
 #define CBFS_HEADPTR_ADDR 0xFFFFFFFc
 #define CBFS_VERSION1 0x31313131
diff --git a/src/util.h b/src/util.h
index 1eafce0..24e39d1 100644
--- a/src/util.h
+++ b/src/util.h
@@ -367,4 +367,11 @@
 // version (auto generated file out/version.c)
 extern const char VERSION[];
 
+// XXX - optimize
+#define ntohl(x) ((((x)&0xff)<<24) | (((x)&0xff00)<<8) | \
+                  (((x)&0xff0000) >> 8) | (((x)&0xff000000) >> 24))
+#define htonl(x) ntohl(x)
+#define ntohs(x) ((((x)&0xff)<<8) | (((x)&0xff00)>>8))
+#define htons(x) ntohs(x)
+
 #endif // util.h