phosphor-ipmi-fru: Add eeprom detection by OF name

This allows us to provide names without hardcoding an i2c bus path.

Change-Id: I402cc5e0696bf328acdfc58c222b055557930857
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/recipes-phosphor/ipmi/phosphor-ipmi-fru/obmc-read-eeprom@.service b/recipes-phosphor/ipmi/phosphor-ipmi-fru/obmc-read-eeprom@.service
index ae8c038..1486cac 100644
--- a/recipes-phosphor/ipmi/phosphor-ipmi-fru/obmc-read-eeprom@.service
+++ b/recipes-phosphor/ipmi/phosphor-ipmi-fru/obmc-read-eeprom@.service
@@ -7,6 +7,7 @@
 Restart=no
 Type=oneshot
 EnvironmentFile={envfiledir}/obmc/eeproms/%I
+ExecStartPre={bindir}/of-name-to-eeprom.sh {envfiledir}/obmc/eeproms/%I
 ExecStart=/usr/bin/env phosphor-read-eeprom --eeprom $SYSFS_PATH --fruid $FRUID
 SyslogIdentifier=phosphor-read-eeprom