kmod-6.1-neuron: update to 2.18.12.0

[bcressey]

Issue number:
N/A

Description of changes:
Update to the 2.18.12.0 release of the Neuron driver. See release notes for more details.

Testing done:
Added kmod-6.1-neuron to the aws-dev variant, started it, and verified that the neuron tools ran:

bash-5.1# docker run -it --rm --device=/dev/neuron0 863599026182.dkr.ecr.us-west-2.amazonaws.com/neuron-tools:latest neuron-ls
instance-type: inf2.xlarge
instance-id: i-01937b1bd51e090f9
+--------+--------+--------+---------+
| NEURON | NEURON | NEURON |   PCI   |
| DEVICE | CORES  | MEMORY |   BDF   |
+--------+--------+--------+---------+
| 0      | 2      | 32 GB  | 00:1f.0 |

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[yeazelm]

LGTM!