Update to kernel headers v5.2.

Test: Booted a taimen, ran unit bionic unit tests.
Change-Id: I3522c59793bbcef98ea515996a481d92f14b8816
diff --git a/libc/kernel/uapi/linux/if_ether.h b/libc/kernel/uapi/linux/if_ether.h
index 4fb58f1..9e0b15c 100644
--- a/libc/kernel/uapi/linux/if_ether.h
+++ b/libc/kernel/uapi/linux/if_ether.h
@@ -90,6 +90,7 @@
 #define ETH_P_QINQ2 0x9200
 #define ETH_P_QINQ3 0x9300
 #define ETH_P_EDSA 0xDADA
+#define ETH_P_DSA_8021Q 0xDADB
 #define ETH_P_IFE 0xED3E
 #define ETH_P_AF_IUCV 0xFBFB
 #define ETH_P_802_3_MIN 0x0600