Add POST code for "All devices initialized"

Right now we only had a post code for "All devices enabled" which
was emitted at the wrong time (after the device initialize stage
rather than the device enable stage)

Change-Id: Iee82bff020de844c7095703f8d6521953003032c
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1693
Reviewed-by: Marc Jones <marcj303@gmail.com>
Tested-by: build bot (Jenkins)

src/include/console/post_codes.h

@@ -133,6 +133,13 @@
  */
 #define POST_DEVICES_ENABLED			0x89
 
+/**
+ * \brief Devices have been initialized
+ *
+ * Devices have been initialized.
+ */
+#define POST_DEVICES_INITIALIZED		0x8a
+
 /**
  * \brief Entry into elf boot
  *