PEL: Change PEL subsystem val for device errors

Change the subsystem value to the I2C subsystem for device read/write
errors.  Before it was cec_chip_iface, which was used because it sounded
more generic though technically was meant for FSI, and would have been
better for errors logged against the processors.

It turned out though that this error would never be logged against
anything using FSI anyway, so just change them all to I2C.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Ib85834398a52f1872af109242dd84e693381255d
diff --git a/extensions/openpower-pels/registry/message_registry.json b/extensions/openpower-pels/registry/message_registry.json
index fe7dc97..38bde21 100644
--- a/extensions/openpower-pels/registry/message_registry.json
+++ b/extensions/openpower-pels/registry/message_registry.json
@@ -142,7 +142,7 @@
 
         {
             "Name": "xyz.openbmc_project.Sensor.Device.Error.ReadFailure",
-            "Subsystem": "cec_chip_iface",
+            "Subsystem": "cec_i2c",
 
             "SRC":
             {
@@ -171,7 +171,7 @@
 
         {
             "Name": "xyz.openbmc_project.Common.Device.Error.ReadFailure",
-            "Subsystem": "cec_chip_iface",
+            "Subsystem": "cec_i2c",
 
             "SRC":
             {
@@ -200,7 +200,7 @@
 
         {
             "Name": "xyz.openbmc_project.Control.Device.Error.WriteFailure",
-            "Subsystem": "cec_chip_iface",
+            "Subsystem": "cec_i2c",
 
             "SRC":
             {
@@ -229,7 +229,7 @@
 
         {
             "Name": "xyz.openbmc_project.Common.Device.Error.WriteFailure",
-            "Subsystem": "cec_chip_iface",
+            "Subsystem": "cec_i2c",
 
             "SRC":
             {