Move/remove android only kernel uapi headers.

Move all of the uapi kernel headers that are only found in the android
kernel, and are still used by the tree into their own directory.

Delete all of these files that are not used.

Also, delete binder.h from the linux directory since it already exists
in the linux/android directory.

Bug: 30072483
Change-Id: I879f16e366f7670b8be3546b0a9cf9567fce6526
diff --git a/libc/kernel/android/README.TXT b/libc/kernel/android/README.TXT
new file mode 100644
index 0000000..dab5f42
--- /dev/null
+++ b/libc/kernel/android/README.TXT
@@ -0,0 +1,6 @@
+The files under this directory are android kernel uapi header files that
+exist in android kernels, but have not been upstreamed into the regular
+kernel.
+
+None of these files will get updated automatically, and are frozen at their
+current value.