siemens: eeprom: clean up definitions

Move the I2C and EEPROM address definitions in common board header.

Reviewed-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Signed-off-by: Enrico Leto <enrico.leto@siemens.com>
diff --git a/board/siemens/pxm2/board.c b/board/siemens/pxm2/board.c
index 40aee7c..9e85d9b 100644
--- a/board/siemens/pxm2/board.c
+++ b/board/siemens/pxm2/board.c
@@ -36,6 +36,7 @@
 #include <cpsw.h>
 #include <watchdog.h>
 #include "board.h"
+#include "../common/eeprom.h"
 #include "../common/factoryset.h"
 #include "pmic.h"
 #include <nand.h>