ethtool: set individual channels if combined is not available

[mmcgee-jump]

netlink error: requested channel count exceeds maximum (offset 36)
netlink error: Invalid argument```

```[nbridge@fpip3-compute0951 ~]$ ethtool -l eno1
Channel parameters for eno1:
Pre-set maximums:
RX:             4
TX:             4
Other:          n/a
Combined:       n/a
Current hardware settings:
RX:             4
TX:             1
Other:          n/a
Combined:       n/a```

```[nbridge@emny-ossdev-firedancer11 firedancer]$ ethtool -l ens3f0
Channel parameters for ens3f0:
Pre-set maximums:
RX:             n/a
TX:             n/a
Other:          1
Combined:       64
Current hardware settings:
RX:             n/a
TX:             n/a
Other:          1
Combined:       1```