m68k: add amcore board support

Add Sysam Amcore m68k-based board support.

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 78c98ed..53c4aab 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -67,6 +67,9 @@
 config TARGET_M5485EVB
 	bool "Support M5485EVB"
 
+config TARGET_AMCORE
+	bool "Support AMCORE"
+
 endchoice
 
 source "board/BuS/eb_cpu5282/Kconfig"
@@ -89,5 +92,6 @@
 source "board/freescale/m54455evb/Kconfig"
 source "board/freescale/m547xevb/Kconfig"
 source "board/freescale/m548xevb/Kconfig"
+source "board/sysam/amcore/Kconfig"
 
 endmenu