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/sound/compress_offload.h b/libc/kernel/uapi/sound/compress_offload.h
index 8928cbf..0f6077f 100644
--- a/libc/kernel/uapi/sound/compress_offload.h
+++ b/libc/kernel/uapi/sound/compress_offload.h
@@ -72,7 +72,7 @@
   struct snd_codec_desc descriptor[MAX_NUM_CODEC_DESCRIPTORS];
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 } __attribute__((packed, aligned(4)));
-enum {
+enum sndrv_compress_encoder {
   SNDRV_COMPRESS_ENCODER_PADDING = 1,
   SNDRV_COMPRESS_ENCODER_DELAY = 2,
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */