Remove papi_pe_allocate_registers
Remove papi_pe_allocate_registers

On perf_event this code wasn't really doing anything useful, as
update_control_state would end up re-doing any possible tests
we could want to do here.

arm-hpc/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi