This is charrypick of 9ead991784
and https://github.com/ROCm-Developer-Tools/HIP/pull/2009
Fix cmake config file
Removed cmake target files under packaging directory.
Merged cmake config .in files for HIP-Clang and HCC as one.
Use cmake generated target files in both install and packaging.
This makes cmake config file consistent for make install and
make package.
Let device side malloc/free return nullptr and trap
Change-Id: I448f3ea2d4934648089bad371debc203f895cba6
Yaxun (Sam) Liu
Maneesh Gupta