fix(uuid): add missing `#include` directives

These include directives were missing from both `uuid.h` files.

Change-Id: I875dfda3e0985728277b72f0e7597dde5cf9d304
Signed-off-by: Chris Kay <chris.kay@arm.com>
diff --git a/changelog.yaml b/changelog.yaml
index a514abd..7dcb4df 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -1190,6 +1190,9 @@
             deprecated:
               - plat/nxp/common/psci
 
+      - title: UUID
+        scope: uuid
+
   - title: Documentation
     scope: docs
 
@@ -1278,4 +1281,3 @@
 
       - title: zlib
         scope: zlib
-