Update to v5.11 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.11

Test: Built cuttlefish and flame images. Ran bionic unit tests on both.
Change-Id: Ie60337aafad4bda55af99b6c8fe9f56bf2fa787f
diff --git a/libc/kernel/uapi/linux/if_ether.h b/libc/kernel/uapi/linux/if_ether.h
index c3e0718..8405653 100644
--- a/libc/kernel/uapi/linux/if_ether.h
+++ b/libc/kernel/uapi/linux/if_ether.h
@@ -80,6 +80,7 @@
 #define ETH_P_1588 0x88F7
 #define ETH_P_NCSI 0x88F8
 #define ETH_P_PRP 0x88FB
+#define ETH_P_CFM 0x8902
 #define ETH_P_FCOE 0x8906
 #define ETH_P_IBOE 0x8915
 #define ETH_P_TDLS 0x890D