tree 97f739978d9400366e2c98d78ea594008de8253e
parent 10d4542dbed95736ccd2fcea6c66ab0bf185b144
author Matt Spinler <spinler@us.ibm.com> 1734030116 -0600
committer Matt Spinler <spinler@us.ibm.com> 1734038490 -0600

control: Load only 1 pcie_cards.json

The pcie_cards.json file contains PCIe cards that need special fan floor
values.  The previous code would attempt to load multiple files, based
on the thinking that there might be a common file that is shared between
systems and then other system specific files with just the cards that
are different.

In practice this feature was never used, and made systems harder to
patch in /etc/ since even after a file was found in /etc the file would
also be loaded out of /usr, overwriting the values.

Tested:
A file was put in each non default location of:

```
/etc/phosphor-fan-presence/control/
/etc/phosphor-fan-presence/control/com.ibm.Hardware.Chassis.Model.Rainier4U/

/usr/share/phosphor-fan-presence/control/
/usr/share/phosphor-fan-presence/control/com.ibm.Hardware.Chassis.Model.Rainier/
```

With the existing file in flash at:
/usr/share/ ... /com.ibm.Hardware.Chassis.Model.Rainier4U/

And in each case the correct file was chosen.  Verified using the traces
shown on startup like:

```
Loading configuration from /etc/phosphor-fan-presence/control/pcie_cards.json
```

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I14b849a2bff65402508ef92e293f3237729721e5