Install current VNDK libs to the versioned directories.

If PLATFORM_VNDK_VERSION has a version $VER other than "current",
install current VNDK libs to /system/lib[64]/vndk[-sp]-$VER.
Otherwise, they will be installed to /system/lib[64]/vndk[-sp].

Bug: 69883025
Test: device boot
Change-Id: Ifa8564f39687dab5b407bf2178b13022625a94f3
diff --git a/android/variable.go b/android/variable.go
index ab8103a..6815438 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -111,6 +111,7 @@
 	Platform_sdk_final                *bool    `json:",omitempty"`
 	Platform_version_active_codenames []string `json:",omitempty"`
 	Platform_version_future_codenames []string `json:",omitempty"`
+	Platform_vndk_version             *string  `json:",omitempty"`
 
 	DeviceName        *string   `json:",omitempty"`
 	DeviceArch        *string   `json:",omitempty"`