Remove structures now found in kernel headers.

The new v4.20.1 kernel headers have the definitions, so remove the
duplicates.

Test: Builds.
Change-Id: I6ba3e7589f3abd66aec6dcda498d990012d64b11
Merged-In: I6ba3e7589f3abd66aec6dcda498d990012d64b11
(cherry picked from commit 969e1524cc398a7ddb3d841f649f138f25d1a58f)
diff --git a/include/hwbinder/binder_kernel.h b/include/hwbinder/binder_kernel.h
index f78b294..d44dca9 100644
--- a/include/hwbinder/binder_kernel.h
+++ b/include/hwbinder/binder_kernel.h
@@ -36,15 +36,4 @@
         FLAT_BINDER_FLAG_INHERIT_RT = 0x800,
 };
 
-struct binder_node_info_for_ref {
-        __u32            handle;
-        __u32            strong_count;
-        __u32            weak_count;
-        __u32            reserved1;
-        __u32            reserved2;
-        __u32            reserved3;
-};
-
-#define BINDER_GET_NODE_INFO_FOR_REF	_IOWR('b', 12, struct binder_node_info_for_ref)
-
 #endif // ANDROID_HARDWARE_BINDER_KERNEL_H