cmake: remove architecture dependency from Eigen3ConfigVersion.cmake
cmake: remove architecture dependency from Eigen3ConfigVersion.cmake

Also, install Eigen3*.cmake under $prefix/share/eigen3/cmake by default.

ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen