if_ether.h: add PROFINET Ethertype

Add the Ethertype for PROFINET protocol.
Signed-off-by: Daniel Braunwarth <daniel@braunwarth.dev>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/uapi/linux/if_ether.h

@@ -86,6 +86,7 @@
 					 * over Ethernet
 					 */
 #define ETH_P_PAE	0x888E		/* Port Access Entity (IEEE 802.1X) */
+#define ETH_P_PROFINET	0x8892		/* PROFINET			*/
 #define ETH_P_REALTEK	0x8899          /* Multiple proprietary protocols */
 #define ETH_P_AOE	0x88A2		/* ATA over Ethernet		*/
 #define ETH_P_8021AD	0x88A8          /* 802.1ad Service VLAN		*/