Enable testing of device code for Native CPU adapter

Currently conformance tests which rely on device code do not work correctly for the Native CPU adapter. This is due to the adapter relying on function pointers in the SYCL RT rather than an binary blob containing SPIR-V/PTX/ASM. In order to enable the entire CTS on the Native CPU adapter we need to deterine how to enable testing of device code and implement these changes in the CTS.