Add 31.0 to PLATFORM_SEPOLICY_COMPAT_VERSIONS

Bug: 189161483
Bug: 207344718
Test: m selinux_policy
Change-Id: I48b681fb28c78ea9dca922f5fb58f19a940c1a51
Merged-In: I48b681fb28c78ea9dca922f5fb58f19a940c1a51
(cherry picked from commit 94c27efb68b124fad1f291fb7c3865777403d20f)
diff --git a/core/config.mk b/core/config.mk
index a086e5c..5a0a51e 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -792,6 +792,7 @@
     28.0 \
     29.0 \
     30.0 \
+    31.0 \
 
 .KATI_READONLY := \
     PLATFORM_SEPOLICY_COMPAT_VERSIONS \