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/kernel-page-flags.h b/libc/kernel/uapi/linux/kernel-page-flags.h
index ce30be7..7e34fe4 100644
--- a/libc/kernel/uapi/linux/kernel-page-flags.h
+++ b/libc/kernel/uapi/linux/kernel-page-flags.h
@@ -48,4 +48,7 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define KPF_THP 22
 #define KPF_BALLOON 23
+#define KPF_ZERO_PAGE 24
+#define KPF_IDLE 25
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif