drm_hwcomposer: Fix up some printf warnings and a clang-style nit

BUG=None
TEST=Compiles

Change-Id: Ie95aad60b225784c36d411ec16a34ff32ea8acc6
Signed-off-by: Sean Paul <seanpaul@chromium.org>
diff --git a/drmplane.cpp b/drmplane.cpp
index 2314c39..c4ea722 100644
--- a/drmplane.cpp
+++ b/drmplane.cpp
@@ -19,6 +19,7 @@
 #include "drmplane.h"
 #include "drmresources.h"
 
+#include <cinttypes>
 #include <errno.h>
 #include <stdint.h>
 
@@ -53,7 +54,7 @@
       type_ = (uint32_t)type;
       break;
     default:
-      ALOGE("Invalid plane type %d", type);
+      ALOGE("Invalid plane type %" PRIu64, type);
       return -EINVAL;
   }