Remove no longer needed Arm specific words in the LICENSE.txt file.

As the codebase is now under the Apache 2.0 license with LLVM
Exceptions, and all Arm's contributions, past or future, are under that
new license, this Arm specific words in LICENSE.txt are no longer
needed.

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@352377 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed