[PATCH] switch_mm and enter_lazy_tlb: remove cpu arg

[PATCH] switch_mm and enter_lazy_tlb: remove cpu arg

switch_mm and enter_lazy_tlb take a CPU arg, which is always
smp_processor_id().  This is misleading, and pointless if they use
per-cpu variables or other optimizations.  gcc will eliminate
redundant smp_processor_id() (in inline functions) anyway.

This removes that arg from all the architectures.