ec2: PrefixList.fromLookup should support tokens, particularly cdk.Aws.REGION

### Describe the feature

The highly requested #15115 led to the development of `PrefixList.fromLookup`. However, trying to use it proved to be a bit tricky. The following code does not work:

```ts
const s3PrefixList = ec2.PrefixList.fromLookup(this, 'S3PrefixList', {
prefixListName: `com.amazonaws.${cdk.Aws.REGION}.s3`,
});
```

Tokens such as `cdk.Aws.REGION` are not allowed: https://github.com/aws/aws-cdk/blob/aea1372ab7bc68c489cea5ee5e499233755910e8/packages/aws-cdk-lib/aws-ec2/lib/prefix-list.ts#L168-L171

### Use Case

Using `cdk.Aws.REGION` is very convenient, because it is accessible anywhere, quite easily. If I need a non-tokenized region value, I will have to hard-code it to stack params, and cascade it over the entire construct tree.

### Proposed Solution

Just allow the `cdk.Aws.REGION` to be used within `prefixListName` of the `PrefixList.fromLookup` method.

### Other Information

_No response_

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### AWS CDK Library version (aws-cdk-lib)

2.201.0

### AWS CDK CLI version

2.1018.1 (build cb71364)

### Environment details (OS name and version, etc.)

Win11

Start in aws-ec2/lib/prefix-list.ts at the validation linked in the issue, then inspect the existing PrefixList.fromLookup tests. Confirm that a tokenized prefixListName such as cdk.Aws.REGION is accepted and add coverage showing the lookup works with it.

Written by the indexing model from the issue text.