siemens: eeprom: simplify setup & read

Since we have boards using the driver model or not for i2c, use abstraction
function to probe the i2c, check the EEPROM and read from EEPROM.

Signed-off-by: Enrico Leto <enrico.leto@siemens.com>
diff --git a/board/siemens/capricorn/Makefile b/board/siemens/capricorn/Makefile
index d5846cc..4dafac1 100644
--- a/board/siemens/capricorn/Makefile
+++ b/board/siemens/capricorn/Makefile
@@ -4,6 +4,7 @@
 #
 
 obj-y += board.o
+obj-y += ../common/eeprom.o
 
 ifdef CONFIG_SPL_BUILD
 obj-y += spl.o