soong_config: Allow process-specific override of target SDK version

Change-Id: I775e852c17af12d2233e644e3db10c10bcb20d19
Signed-off-by: Jackeagle <jackeagle102@gmail.com>
diff --git a/build/soong/android/variable.go b/build/soong/android/variable.go
index 1ef2e56..c11ec95 100644
--- a/build/soong/android/variable.go
+++ b/build/soong/android/variable.go
@@ -22,6 +22,9 @@
 		Cppflags []string
 		Shared_libs []string
 	}
+	Target_process_sdk_version_override struct {
+		Cppflags []string
+	}
 }
 
 type ProductVariables struct {
@@ -33,4 +36,5 @@
 	Uses_nvidia_enhancements  *bool `json:",omitempty"`
 	Uses_qcom_bsp_legacy  *bool `json:",omitempty"`
 	Uses_qti_camera_device  *bool `json:",omitempty"`
+ 	Target_process_sdk_version_override *string `json:",omitempty"`
 }