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/if_link.h b/libc/kernel/uapi/linux/if_link.h
index 45ef92b..7843fb5 100644
--- a/libc/kernel/uapi/linux/if_link.h
+++ b/libc/kernel/uapi/linux/if_link.h
@@ -144,6 +144,8 @@
   IFLA_NEW_IFINDEX,
   IFLA_MIN_MTU,
   IFLA_MAX_MTU,
+  IFLA_PROP_LIST,
+  IFLA_ALT_IFNAME,
   __IFLA_MAX
 };
 #define IFLA_MAX (__IFLA_MAX - 1)