Updating version to 2.3.7 to reflect some patches.

Change-Id: I6118b41a26a1ea6940758313871eb8ab83ab06a2
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 658a803..f19a3c6 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -41,7 +41,7 @@
   # 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 := 2.3.6
+  PLATFORM_VERSION := 2.3.7
 endif
 
 ifeq "" "$(PLATFORM_SDK_VERSION)"