Remove obsolete BRILLO variable

Test: none
Change-Id: Ia4474927709ccfa1ff76f5dda1d8aa13ef9d1004
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 8b2dfd1..bf40fe3 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -108,7 +108,6 @@
 
 $(call add_json_bool, ArtUseReadBarrier,                 $(call invert_bool,$(filter false,$(PRODUCT_ART_USE_READ_BARRIER))))
 $(call add_json_bool, Binder32bit,                       $(BINDER32BIT))
-$(call add_json_bool, Brillo,                            $(BRILLO))
 $(call add_json_str,  BtConfigIncludeDir,                $(BOARD_BLUETOOTH_BDROID_BUILDCFG_INCLUDE_DIR))
 $(call add_json_bool, Device_uses_hwc2,                  $(filter true,$(TARGET_USES_HWC2)))
 $(call add_json_list, DeviceKernelHeaders,               $(TARGET_PROJECT_SYSTEM_INCLUDES))