Frameworks/base: Fix two warnings in cmds

Change-Id: Ifb9c7fb7a2d28c13010ddc186bea5f5f0daefb4a
diff --git a/include/androidfw/ResourceTypes.h b/include/androidfw/ResourceTypes.h
index f7730f2f..a44975b 100644
--- a/include/androidfw/ResourceTypes.h
+++ b/include/androidfw/ResourceTypes.h
@@ -1773,9 +1773,7 @@
             const char* targetPath, const char* overlayPath,
             void** outData, size_t* outSize) const;
 
-    enum {
-        IDMAP_HEADER_SIZE_BYTES = 4 * sizeof(uint32_t) + 2 * 256,
-    };
+    static const size_t IDMAP_HEADER_SIZE_BYTES = 4 * sizeof(uint32_t) + 2 * 256;
 
     // Retrieve idmap meta-data.
     //