Fix a bug we've had for ages.

On some sun4m the pagetables must be uncached. This is indicated by the
CPUFLG_CACHEPAGETABLES in cpuinfo.flags. This was done in pmap_bootstrap4m.
The problem is that the CPUFLG_CACHEPAGETABLES is not set until after
pmap_bootstrap4m, so even the machines that could cache the pagetables
had them uncached, reducing performance.
Fix this by creating pmap_cache_enable that is called just after the
cache has been switched on (XXX - actually, we should call it before, but
CPUFLG_CACHEPAGETABLES can be set in the code that enables the cache).

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