Do not pass VndkUseCoreVariant into Soong

VNDK use core variant is deprecated, so there is no meaning to pass this
variable into Soong. This change removes TARGET_VNDK_USE_CORE_VARIANT
passing into soong variable.

Bug: 330100430
Test: AOSP CF build succeeded
Change-Id: I5f46764862c7b32fbf48b942c4ac07426e97d6dd
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 7300e8c..7402d2b 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -167,7 +167,6 @@
 $(call add_json_list, BootJars,                          $(PRODUCT_BOOT_JARS))
 $(call add_json_list, ApexBootJars,                      $(filter-out $(APEX_BOOT_JARS_EXCLUDED), $(PRODUCT_APEX_BOOT_JARS)))
 
-$(call add_json_bool, VndkUseCoreVariant,                $(TARGET_VNDK_USE_CORE_VARIANT))
 $(call add_json_bool, VndkSnapshotBuildArtifacts,        $(VNDK_SNAPSHOT_BUILD_ARTIFACTS))
 
 $(call add_json_map,  BuildFlags)