msys: axp-amc: fix mpp configuration

	Due to inappropriate condition check MPP group #0 was overwritten during
	configuration, which caused NETA port #0 operation to fail.

Change-Id: I8db09c83dc9d71f29f8a6c0fbbf72519fb872250
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: Omri Itach <omrii@marvell.com>
Reviewed-on: http://vgitil04.il.marvell.com:8080/20568
Tested-by: Star_Automation <star@marvell.com>
1 file changed