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

[via llvm-commits]

agozillon wrote:

Thank you very much for the review @bhandarkar-pranav and @abidh! 

Do my modifications and added information help clarify things a bit better @abidh ? Happy to try and explain my thought process a bit further if it helps at all :-)

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