platform/build/make - S is now 31

Bug: 171506470
Test: Build
Change-Id: I1f3475479659855c0185236f88bc388a61844968
diff --git a/core/config.mk b/core/config.mk
index d1746ef..93c5db1 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -769,7 +769,7 @@
 # is made which breaks compatibility with the previous platform sepolicy version,
 # not just on every increase in PLATFORM_SDK_VERSION.  The minor version should
 # be reset to 0 on every bump of the PLATFORM_SDK_VERSION.
-sepolicy_major_vers := 30
+sepolicy_major_vers := 31
 sepolicy_minor_vers := 0
 
 ifneq ($(sepolicy_major_vers), $(PLATFORM_SDK_VERSION))