[Coverity] Copy instead of move in `opencl-aot` sources

[AlexeySachkov]

See issues at https://scan.coverity.com/projects/intel-llvm?tab=analysis_settings

CID 441823:

llvm/opencl/opencl-aot/source/utils.cpp

Line 237 in f9a7cc8

PlatformName = PlatformNameOnLoopIteration;

CID 489601, 489899, 490542, 490178, 489850:

llvm/opencl/opencl-aot/source/utils.cpp

Lines 172 to 179 in f9a7cc8

	std::map<DeviceType, std::vector<std::string>>
	DeviceTypesToSupportedPlatformNames{
	{cpu, {StrIntelPlatformCommon, StrIntelPlatformCpuRt}},
	{gpu,
	{StrIntelPlatformCommon, StrIntelPlatformNeoHd,
	StrIntelPlatformNeoUhd}},
	{fpga_fast_emu,
	{StrIntelPlatformFastEmu, StrIntelPlatformFastEmuPreview}}};