soong_config: Add TARGET_USES_QCOM_BSP_LEGACY

Change-Id: Ia5ddfa263df71388b19c77d2509c29791177208d
diff --git a/build/soong/android/variable.go b/build/soong/android/variable.go
index 8ed22f7..221bf97 100644
--- a/build/soong/android/variable.go
+++ b/build/soong/android/variable.go
@@ -6,10 +6,14 @@
 	Uses_generic_camera_parameter_library struct {
 		Srcs []string
 	}
+	Uses_qcom_bsp_legacy struct {
+		Cppflags []string
+	}
 }
 
 type ProductVariables struct {
 	Uses_generic_camera_parameter_library  *bool `json:",omitempty"`
 	Specific_camera_parameter_library  *string `json:",omitempty"`
 	Needs_text_relocations  *bool `json:",omitempty"`
+	Uses_qcom_bsp_legacy  *bool `json:",omitempty"`
 }