Add BOARD_KERNEL_MODULE_INTERFACE_VERSIONS.

This is a list of KMI versions used to filter gki_apex modules. Only
gki_apex modules with kmi_version field that are in the list are created.

Test: build GKI APEXes
Bug: 162888350
Change-Id: I0f582f6ea200d52482fd4065c8f4f8b32efc4dee
diff --git a/core/board_config.mk b/core/board_config.mk
index 43a34f9..391e280 100644
--- a/core/board_config.mk
+++ b/core/board_config.mk
@@ -94,6 +94,7 @@
 # Kernel related variables
 _board_strip_readonly_list += \
   BOARD_KERNEL_BINARIES \
+  BOARD_KERNEL_MODULE_INTERFACE_VERSIONS \
 
 _build_broken_var_list := \
   BUILD_BROKEN_DUP_RULES \