[OpenMP52][LIBOMPTARGET] Do not throw error in omp_get_mapped_ptr for the host (#80038)

OpenMP spec 5.2 specifies return value to be the host ptr
in case of device_num being same as omp_get_initial_device().

GitOrigin-RevId: 5f6640e268b5e6ead22983ba9e2074e3bbf0612b
1 file changed