Remove ThinLTO workaround for VNDK

VNDK is deprecated. The build is passing without the workaround.

Test: presubmit
Bug: 169217596
Change-Id: I7cf2c33984c50d06f3e69ebc916ce6a89468204a
diff --git a/cc/lto.go b/cc/lto.go
index 05fa8ee..a084db7 100644
--- a/cc/lto.go
+++ b/cc/lto.go
@@ -90,10 +90,6 @@
 	} else if ctx.testBinary() || ctx.testLibrary() {
 		// Do not enable LTO for tests for better debugging.
 		ltoEnabled = false
-	} else if ctx.isVndk() {
-		// FIXME: ThinLTO for VNDK produces different output.
-		// b/169217596
-		ltoEnabled = false
 	}
 
 	lto.Properties.LtoDefault = ltoDefault