metrics-ipmi-blobs: Support ECC Error Counts

Export the ECC Error Cournter from
http://github.com/openbmc/phosphor-ecc to ipmi blob.

Tested:
The blob output is updated if MemoryECC dbus object exists compared to
the blob output if MemoryECC doesn't exists.

Change-Id: I2c63dbcd0970afc587f5c2ee01f8c261909f0b08
Signed-off-by: Willy Tu <wltu@google.com>
4 files changed