ltimes kernel underbenchmarks it out of date

[artv3]

Describe the bug

ltimes kernel under benchmarks it out of date. Some of the features it uses may not be supported or have moved namespace.

To Reproduce

Build ltimes which is found in the benchmark.

Expected behavior

It should build.

[rhornung67]

Since there are two versions of LTIMES in RAJAPerf that are implemented using all RAJA variants, we could delete it in RAJA benchmarks.

[artv3]

The neat feature of the version in the benchmark folder is that it has a number of variations, launch, kernel, shared memory and usage of the vectorization framework. I was going take a few mins today to see if I can bring it up to date. If there are things missing I can reach out so we can further discuss.

[artv3]

I was able to address some of the issues in this PR: #1738.

However; other areas involve the vectorization capabilities. I discussed with @rchen20 and he offered to take a look.

[rhornung67]

@artv3 can this issue be closed?