Update to v5.7 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.7

Update the generate_uapi_headers.sh where the types.h file is now in
the right place, but kvm.h is not.

Test: Booted cuttlefish/bonito.
Test: Ran bionic-unit-tests on cuttlefish/bonito.
Change-Id: Ice9ce370a658e320b80f564b34a4431927fcf100
diff --git a/libc/kernel/uapi/linux/net_tstamp.h b/libc/kernel/uapi/linux/net_tstamp.h
index 4e1508a..373d1bb 100644
--- a/libc/kernel/uapi/linux/net_tstamp.h
+++ b/libc/kernel/uapi/linux/net_tstamp.h
@@ -50,6 +50,7 @@
   HWTSTAMP_TX_ON,
   HWTSTAMP_TX_ONESTEP_SYNC,
   HWTSTAMP_TX_ONESTEP_P2P,
+  __HWTSTAMP_TX_CNT
 };
 enum hwtstamp_rx_filters {
   HWTSTAMP_FILTER_NONE,
@@ -68,6 +69,7 @@
   HWTSTAMP_FILTER_PTP_V2_SYNC,
   HWTSTAMP_FILTER_PTP_V2_DELAY_REQ,
   HWTSTAMP_FILTER_NTP_ALL,
+  __HWTSTAMP_FILTER_CNT
 };
 struct scm_ts_pktinfo {
   __u32 if_index;