boards.cfg: fix ML2, am3517_evm and s5p_goni boards

Fix board directory name for ML2 board, and
add missing definitions for am3517_evm and s5p_goni boards.
Signed-off-by: NWolfgang Denk <wd@denx.de>

boards.cfg

@@ -180,7 +180,7 @@ G2000		powerpc	ppc4xx		g2000
 JSE		powerpc	ppc4xx		jse
 korat		powerpc	ppc4xx
 lwmon5		powerpc	ppc4xx
-ML2		powerpc	ppc4xx
+ML2		powerpc	ppc4xx		ml2
 sbc405		powerpc	ppc4xx
 sc3		powerpc	ppc4xx
 t3corp		powerpc	ppc4xx
@@ -262,7 +262,9 @@ omap3_zoom2	arm	arm_cortexa8	zoom2		logicpd		omap3
 omap3_beagle	arm	arm_cortexa8	beagle		ti		omap3
 omap3_evm	arm	arm_cortexa8	evm		ti		omap3
 omap3_sdp3430	arm	arm_cortexa8	sdp3430		ti		omap3
+am3517_evm	arm	arm_cortexa8	am3517evm	logicpd		omap3
 devkit8000	arm	arm_cortexa8	devkit8000	timll		omap3
+s5p_goni	arm	arm_cortexa8	goni		samsung		s5pc1xx
 smdkc100	arm	arm_cortexa8	smdkc100	samsung		s5pc1xx
 ixdpg425	arm	ixp
 lpd7a400	arm	lh7a40x		lpd7a40x