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>

cmd/eeprom.c

@@ -22,6 +22,7 @@
 #include <common.h>
 #include <config.h>
 #include <command.h>
+#include <eeprom.h>
 #include <i2c.h>
 #include <eeprom_layout.h>