android: metadata: Fix addEntry template type

Since we set entries with android tags directly, which are enums and not
arithmetic types, the addEntry template fails to match. Fix this by also
allowing enum values in addEntry.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/android/camera_metadata.h

@@ -34,7 +34,8 @@ public:
 	bool hasEntry(uint32_t tag) const;
 
 	template<typename T,
-		 std::enable_if_t<std::is_arithmetic_v<T>> * = nullptr>
+		 std::enable_if_t<std::is_arithmetic_v<T> ||
+				  std::is_enum_v<T>> * = nullptr>
 	bool addEntry(uint32_t tag, const T &data)
 	{
 		return addEntry(tag, &data, 1, sizeof(T));