Added support in Mavlink Ethernet channel parameters

Mavlink Ethernet channel settings such as udp port, remote port and broadcast mode now can be changed dynamically via parameters.

cmake/px4_add_board.cmake

@@ -61,6 +61,7 @@
 #			[ TESTING ]
 #			[ LINKER_PREFIX <string> ]
 #			[ EMBEDDED_METADATA <string> ]
+#			[ ETHERNET ]
 #			)
 #
 #	Input:
@@ -86,6 +87,7 @@
 #		CONSTRAINED_MEMORY	: flag to enable constrained memory options (eg limit maximum number of uORB publications)
 #		TESTING			: flag to enable automatic inclusion of PX4 testing modules
 #		LINKER_PREFIX	: optional to prefix on the Linker script.
+#		ETHERNET		: flag to indicate that ethernet is enabled
 #
 #
 #	Example:
@@ -163,6 +165,7 @@ function(px4_add_board)
 			CONSTRAINED_FLASH
 			CONSTRAINED_MEMORY
 			TESTING
+			ETHERNET
 		REQUIRED
 			PLATFORM
 			VENDOR
@@ -269,6 +272,10 @@ function(px4_add_board)
 		set(PX4_TESTING "1" CACHE INTERNAL "testing enabled" FORCE)
 	endif()
 
+	if(ETHERNET)
+		set(PX4_ETHERNET "1" CACHE INTERNAL "ethernet enabled" FORCE)
+	endif()
+
 	if(LINKER_PREFIX)
 		set(PX4_BOARD_LINKER_PREFIX ${LINKER_PREFIX} CACHE STRING "PX4 board linker prefix" FORCE)
 	else()