m68k: add board stmark2, mcf5441x based

Sysam stmark2 board is a generic and fully (hw and sw) open board, with
a mcf54415 Coldfire CPU, 128MB of DDR2, 16MB of SPI flash and SD card
as non volatile memories, and a wifi module included on-board.
The board is actually used mainly for Coldfire custodian testing activity
related to the mcf5441x Coldfire family.

For further information please see: http://sysam.it/cff_stmark2.html

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
---

Changes in v2:
 - remove CMD_REGINFO
 - add board information in commit message
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 26509b7..42fb915 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -200,6 +200,10 @@
 	bool "Support AMCORE"
 	select M5307
 
+config TARGET_STMARK2
+        bool "Support stmark2"
+        select M54418
+
 endchoice
 
 source "board/BuS/eb_cpu5282/Kconfig"
@@ -223,5 +227,6 @@
 source "board/freescale/m547xevb/Kconfig"
 source "board/freescale/m548xevb/Kconfig"
 source "board/sysam/amcore/Kconfig"
+source "board/sysam/stmark2/Kconfig"
 
 endmenu