Export the sqlite build flag to more products

sqlite is used in many products, including the Android system,
mainline modules, and sdks.  The trunk-stable build flag must be
exported to all of these targets.

Bug: 323176655

Change-Id: I23480610b710c0ec3e49c364c179ea76297fb494
diff --git a/target/board/mainline_sdk/BoardConfig.mk b/target/board/mainline_sdk/BoardConfig.mk
index 84f8b2d..e4c6a8c 100644
--- a/target/board/mainline_sdk/BoardConfig.mk
+++ b/target/board/mainline_sdk/BoardConfig.mk
@@ -13,6 +13,9 @@
 # limitations under the License.
 #
 
+# Ensure all trunk-stable flags are available.
+include build/make/target/product/build_variables.mk
+
 TARGET_ARCH_SUITE := mainline_sdk
 
 HOST_CROSS_OS := linux_bionic