HIP: Find hip-lang-config.cmake with REQUIRED

Merged Mészáros Gergely requested to merge Maetveis/cmake:required_hip_lang_package into master

Use REQUIRED for the find_package that loads the hip config, because it may fail, e.g. because dependent libraries are not found. Before this if the find_package failed cmake silently continued, skipping any hip specific compile flags on targets, resulting in failures at build.

Edited by Mészáros Gergely

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