[flang] [llvm] [Flang][OpenMP] Fix mapping of character type with LEN > 1 specified (PR #154172)

[Pranav Bhandarkar via llvm-commits]

https://github.com/bhandarkar-pranav approved this pull request.

Thanks for the PR, @agozillon. 

https://github.com/llvm/llvm-project/pull/154172