Add android/uapi kernel header.

Add the new android/uapi kernel header include directory.

Bug: 30072483
Change-Id: I3e1394b9abd744c7f76b0ac73bb07f614745a248
diff --git a/cc/x86_device.go b/cc/x86_device.go
index f16e68b..72689fb 100644
--- a/cc/x86_device.go
+++ b/cc/x86_device.go
@@ -171,6 +171,7 @@
 		"-isystem ${LibcRoot}/arch-x86/include",
 		"-isystem ${LibcRoot}/include",
 		"-isystem ${LibcRoot}/kernel/uapi",
+		"-isystem ${LibcRoot}/kernel/android/uapi",
 		"-isystem ${LibcRoot}/kernel/common",
 		"-isystem ${LibcRoot}/kernel/uapi/asm-x86",
 	}, " "))