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-mips/asm/swab.h b/libc/kernel/uapi/asm-mips/asm/swab.h
index 0629d36..d78191d 100644
--- a/libc/kernel/uapi/asm-mips/asm/swab.h
+++ b/libc/kernel/uapi/asm-mips/asm/swab.h
@@ -22,7 +22,7 @@
 #include <linux/types.h>
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __SWAB_64_THRU_32__
-#if defined(__mips_isa_rev) && __mips_isa_rev >= 2 || defined(_MIPS_ARCH_LOONGSON3A)
+#if !defined(__mips16) && (defined(__mips_isa_rev) && __mips_isa_rev >= 2 || defined(_MIPS_ARCH_LOONGSON3A))
 #define __arch_swab16 __arch_swab16
 #define __arch_swab32 __arch_swab32
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */