Update env.cmake for consistency w/ CMakeLists

[mhalk]

This NFC will only change the name of an internal variable. FIND_AQL_PROFILE_LIB to AQLPROFILE_LIB

However, this will increase consistency among three files:

1. ./cmake_modules/env.cmake
2. ./src/api/CMakeLists.txt

• See: https://github.com/ROCm-Developer-Tools/rocprofiler/blob/rocm-5.5.x/src/api/CMakeLists.txt#L40-L42

3. ./src/tools/rocprofv2/CMakeLists.txt

• See: https://github.com/ROCm-Developer-Tools/rocprofiler/blob/rocm-5.5.x/src/tools/rocprofv2/CMakeLists.txt#L7-L8

Which in turn will enable an externally provided -DAQLPROFILE_LIB= to avoid a build termination.

[jrmadsen]

Hi @mhalk, I am in the process of reworking out cmake in general for the purposes of consistency and stability

[mhalk]

Great, thanks for letting me know. We had to patch around this, to avoid build failures -- so, generally looking forward!