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/vsp1.h b/libc/kernel/uapi/linux/vsp1.h
index 28f7fcd..f708b63 100644
--- a/libc/kernel/uapi/linux/vsp1.h
+++ b/libc/kernel/uapi/linux/vsp1.h
@@ -23,7 +23,7 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define VIDIOC_VSP1_LUT_CONFIG _IOWR('V', BASE_VIDIOC_PRIVATE + 1, struct vsp1_lut_config)
 struct vsp1_lut_config {
-  u32 lut[256];
+  __u32 lut[256];
 };
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif