Set N-MR1 to version 7.1.1.

N-MR1 is based on NDR. It has the same API level (25) but includes a few
more bug fixes and is going out to all devices. Hence 7.1.1.

Bug: 31859390
Change-Id: Iaf864b183e90e1ee1503e24cc99ead504c67f147
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 47dc01c..81ff89a 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -43,7 +43,7 @@
   # which is the version that we reveal to the end user.
   # Update this value when the platform version changes (rather
   # than overriding it somewhere else).  Can be an arbitrary string.
-  PLATFORM_VERSION := 7.1
+  PLATFORM_VERSION := 7.1.1
 endif
 
 ifeq "" "$(PLATFORM_SDK_VERSION)"