common: Move old EEPROM functions into a new header

These functions do not use driver model but are still used. Move them to a
new eeprom.h header file.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/compulab/common/eeprom.c b/board/compulab/common/eeprom.c
index 81f69d3..5206cf5 100644
--- a/board/compulab/common/eeprom.c
+++ b/board/compulab/common/eeprom.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <eeprom.h>
 #include <i2c.h>
 #include <eeprom_layout.h>
 #include <eeprom_field.h>