Update kernel headers to v3.14.

Other changes:
- Modify update_all.py to skip ion header files when importing into aosp.
- Fix generate_uapi_headers.sh to handle imports from a linux-stable kernel.

Change-Id: I1ad81b9ccb063c21740f9875f2cc1238052cd4b3
diff --git a/libc/kernel/uapi/asm-arm/asm/hwcap.h b/libc/kernel/uapi/asm-arm/asm/hwcap.h
index 54e433c..e70f3b8 100644
--- a/libc/kernel/uapi/asm-arm/asm/hwcap.h
+++ b/libc/kernel/uapi/asm-arm/asm/hwcap.h
@@ -44,5 +44,7 @@
 #define HWCAP_IDIVT (1 << 18)
 #define HWCAP_VFPD32 (1 << 19)
 #define HWCAP_IDIV (HWCAP_IDIVA | HWCAP_IDIVT)
-#endif
+#define HWCAP_LPAE (1 << 20)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define HWCAP_EVTSTRM (1 << 21)
+#endif