Update to v5.14 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.14

Test: Builds, bionic unit tests.
Change-Id: Iff3424da9fbf7ae89ebeb6daabb34c4aa650901f
diff --git a/libc/kernel/uapi/linux/net_tstamp.h b/libc/kernel/uapi/linux/net_tstamp.h
index 373d1bb..949bcad 100644
--- a/libc/kernel/uapi/linux/net_tstamp.h
+++ b/libc/kernel/uapi/linux/net_tstamp.h
@@ -36,10 +36,15 @@
   SOF_TIMESTAMPING_OPT_STATS = (1 << 12),
   SOF_TIMESTAMPING_OPT_PKTINFO = (1 << 13),
   SOF_TIMESTAMPING_OPT_TX_SWHW = (1 << 14),
-  SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_OPT_TX_SWHW,
+  SOF_TIMESTAMPING_BIND_PHC = (1 << 15),
+  SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_BIND_PHC,
   SOF_TIMESTAMPING_MASK = (SOF_TIMESTAMPING_LAST - 1) | SOF_TIMESTAMPING_LAST
 };
 #define SOF_TIMESTAMPING_TX_RECORD_MASK (SOF_TIMESTAMPING_TX_HARDWARE | SOF_TIMESTAMPING_TX_SOFTWARE | SOF_TIMESTAMPING_TX_SCHED | SOF_TIMESTAMPING_TX_ACK)
+struct so_timestamping {
+  int flags;
+  int bind_phc;
+};
 struct hwtstamp_config {
   int flags;
   int tx_type;