lineage: soong: Add var for linker shim libs

* To limit security exposure, we're forcing all devices
  to define shim libs with a TARGET_LD_SHIM_LIBS

Change-Id: Ic8722c42807429f2faa3546316c71c40533ce195
diff --git a/build/soong/soong_config.mk b/build/soong/soong_config.mk
index b5e469c..9f86c62 100644
--- a/build/soong/soong_config.mk
+++ b/build/soong/soong_config.mk
@@ -7,6 +7,7 @@
 	echo '    "Uses_generic_camera_parameter_library": $(if $(TARGET_SPECIFIC_CAMERA_PARAMETER_LIBRARY),false,true),'; \
 	echo '    "Specific_camera_parameter_library": "$(TARGET_SPECIFIC_CAMERA_PARAMETER_LIBRARY)",'; \
 	echo '    "Needs_text_relocations": $(if $(filter true,$(TARGET_NEEDS_PLATFORM_TEXT_RELOCATIONS)),true,false),'; \
-	echo '    "Uses_qcom_bsp_legacy": $(if $(filter true,$(TARGET_USES_QCOM_BSP_LEGACY)),true,false)'; \
+	echo '    "Uses_qcom_bsp_legacy": $(if $(filter true,$(TARGET_USES_QCOM_BSP_LEGACY)),true,false),'; \
+	echo '    "Target_shim_libs": "$(TARGET_LD_SHIM_LIBS)"'; \
 	echo '},'; \
 	echo '') > $(SOONG_VARIABLES_TMP)