Update to v5.5 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.5

Test: Boots on walleye.
Test: Ran bionic-unit-tests on walleye.
Test: Boots on cuttlefish.
Test: Ran bionic-unit-tests on cuttlefish.
Change-Id: I57387d3c31e0ba5ad125ffe291cecf365c7b374e
Merged-In: I57387d3c31e0ba5ad125ffe291cecf365c7b374e
diff --git a/libc/kernel/uapi/linux/rtnetlink.h b/libc/kernel/uapi/linux/rtnetlink.h
index b0feb7e..14366de 100644
--- a/libc/kernel/uapi/linux/rtnetlink.h
+++ b/libc/kernel/uapi/linux/rtnetlink.h
@@ -145,6 +145,12 @@
 #define RTM_DELNEXTHOP RTM_DELNEXTHOP
   RTM_GETNEXTHOP,
 #define RTM_GETNEXTHOP RTM_GETNEXTHOP
+  RTM_NEWLINKPROP = 108,
+#define RTM_NEWLINKPROP RTM_NEWLINKPROP
+  RTM_DELLINKPROP,
+#define RTM_DELLINKPROP RTM_DELLINKPROP
+  RTM_GETLINKPROP,
+#define RTM_GETLINKPROP RTM_GETLINKPROP
   __RTM_MAX,
 #define RTM_MAX (((__RTM_MAX + 3) & ~3) - 1)
 };