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/asm-arm64/asm/signal.h b/libc/kernel/uapi/asm-arm64/asm/signal.h
index 39f8c48..0ff3e96 100644
--- a/libc/kernel/uapi/asm-arm64/asm/signal.h
+++ b/libc/kernel/uapi/asm-arm64/asm/signal.h
@@ -19,6 +19,8 @@
 #ifndef __ASM_SIGNAL_H
 #define __ASM_SIGNAL_H
 #define SA_RESTORER 0x04000000
-#include <asm-generic/signal.h>
+#define MINSIGSTKSZ 5120
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SIGSTKSZ 16384
+#include <asm-generic/signal.h>
 #endif