Check for depth map payload

The depth map payload presence is required
according to specification.

Bug:123316622
Test: Camera CTS
Change-Id: I4b4174246b7dc21a4d01da638a4563d85fa14317
diff --git a/README.android b/README.android
index 00f3c0b..248e7b6 100644
--- a/README.android
+++ b/README.android
@@ -7,3 +7,4 @@
 -------------
 - Android depth photo validation sequence "ValidateAndroidDynamicDepthBuffer()".
 - Add NDK library variant.
+- Check for depth map payload