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/usb/cdc.h b/libc/kernel/uapi/linux/usb/cdc.h
index 81123cb..4f02fcf 100644
--- a/libc/kernel/uapi/linux/usb/cdc.h
+++ b/libc/kernel/uapi/linux/usb/cdc.h
@@ -16,8 +16,8 @@
  ***
  ****************************************************************************
  ****************************************************************************/
-#ifndef __LINUX_USB_CDC_H
-#define __LINUX_USB_CDC_H
+#ifndef __UAPI_LINUX_USB_CDC_H
+#define __UAPI_LINUX_USB_CDC_H
 #include <linux/types.h>
 #define USB_CDC_SUBCLASS_ACM 0x02
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */