Add defines for CAIF support

Change-Id: I32d2e02814f1965ebdcecb804e947ff303dbe230
Author: Mark Gross <mark.gross@intel.com>
Signed-off-by: Bruce Beare <brucex.j.beare@intel.com>
diff --git a/libc/kernel/common/linux/if_ether.h b/libc/kernel/common/linux/if_ether.h
index 1ba7a99..7e235a5 100644
--- a/libc/kernel/common/linux/if_ether.h
+++ b/libc/kernel/common/linux/if_ether.h
@@ -84,6 +84,7 @@
 #define ETH_P_TRAILER 0x001C  
 #define ETH_P_PHONET 0x00F5  
 #define ETH_P_IEEE802154 0x00F6  
+#define ETH_P_CAIF 0x00F7  
 
 struct ethhdr {
  unsigned char h_dest[ETH_ALEN];