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/nfsd/export.h b/libc/kernel/uapi/linux/nfsd/export.h
index 4d7bfad..c5342e9 100644
--- a/libc/kernel/uapi/linux/nfsd/export.h
+++ b/libc/kernel/uapi/linux/nfsd/export.h
@@ -42,7 +42,8 @@
 #define NFSEXP_NOACL 0x8000
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFSEXP_V4ROOT 0x10000
-#define NFSEXP_ALLFLAGS 0x1FE7F
+#define NFSEXP_PNFS 0x20000
+#define NFSEXP_ALLFLAGS 0x3FE7F
 #define NFSEXP_SECINFO_FLAGS (NFSEXP_READONLY | NFSEXP_ROOTSQUASH | NFSEXP_ALLSQUASH | NFSEXP_INSECURE_PORT)
-#endif
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif