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/scripts/config_whitelist.txt b/scripts/config_whitelist.txt
index db28457..b3dac2d 100644
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@ -2294,6 +2294,7 @@
 CONFIG_STM32_HSE_HZ
 CONFIG_STM32_HZ
 CONFIG_STM32_SERIAL
+CONFIG_STMARK2
 CONFIG_STRIDER
 CONFIG_STRIDER_CON
 CONFIG_STRIDER_CON_DP