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-x86/asm/mtrr.h b/libc/kernel/uapi/asm-x86/asm/mtrr.h
index 135fa33..b697b7f 100644
--- a/libc/kernel/uapi/asm-x86/asm/mtrr.h
+++ b/libc/kernel/uapi/asm-x86/asm/mtrr.h
@@ -98,4 +98,6 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define MTRR_TYPE_WRBACK 6
 #define MTRR_NUM_TYPES 7
+#define MTRR_TYPE_INVALID 0xff
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */