arm, am335x: siemens boards add FIT support

add FIT support and set "boardid" from factoryset records
"DEV/id" and "COMP/ver". "boardid" is used for selecting
which fit configuration gets booted on the board.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/include/configs/pxm2.h b/include/configs/pxm2.h
index d75d562..946b2c8 100644
--- a/include/configs/pxm2.h
+++ b/include/configs/pxm2.h
@@ -150,4 +150,8 @@
 #define CONFIG_SYS_CONSOLE_FG_COL	0x00
 #endif
 
+#ifndef CONFIG_SPL_BUILD
+#define CONFIG_FIT
+#endif
+
 #endif	/* ! __CONFIG_PXM2_H */