Updated to v4.4.1 kernel headers.

Small modifications needed to allow compilation with the new headers:

- Manually modify bionic/libc/kernel/uapi/asm-mips/asm/siginfo.h to
  remove the uapi from the include.
- PR_XXX defines are now available for mips, so remove the definition
  from linker_mips.cpp.

Bug: 23789423
Change-Id: I6dc8a03b012426d3a937db15cb24d3a50fab5a8c
diff --git a/libc/kernel/uapi/linux/fib_rules.h b/libc/kernel/uapi/linux/fib_rules.h
index 49953ef..fdc3577 100644
--- a/libc/kernel/uapi/linux/fib_rules.h
+++ b/libc/kernel/uapi/linux/fib_rules.h
@@ -61,7 +61,7 @@
   FRA_FWMARK,
   FRA_FLOW,
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-  FRA_UNUSED6,
+  FRA_TUN_ID,
   FRA_SUPPRESS_IFGROUP,
   FRA_SUPPRESS_PREFIXLEN,
   FRA_TABLE,