Fix the starting of phosphor-hwmon

After the commit 7ead6495b6d6782dd89951e8bfb26131f35863ec
the phosphor-hwmon failed to start with errors like this:
```
/lib/systemd/system/xyz.openbmc_project.Hwmon@.service:8:
  Failed to resolve unit specifiers on %f: Invalid argument
```

It happens when the instance name begins with `/` character which causes
this error when used specifier `%f`.

Besides the specifier `%I` looks less buggy and more appropriate in this
case, because it's the only part of path and will be completed inside
the `phosphor-hwmon-readd`.

This commit fixes the starting of the phosphor-hwmon.

Partially resolves: openbmc/openbmc#3435

(From meta-phosphor rev: a87fb2d1eb682ed0f04e0f269966b9ae4aafbb1e)

Change-Id: Ia8185f047f23bdcd9141d7edea47ad50e6f7fe07
Signed-off-by: Alexander Filippov <a.filippov@yadro.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>

0 files changed, 0 insertions, 0 deletions