- expose vmparams to userland on arm, like other archs do.
- remove unneeded includes

ISA exists on more that just shark. Fix a comment about this.

Use default PAGER_MAP_DEFAULT_SIZE for ARM and PowerPC, exception
acorn26. This bumps the KVA reservation from 4MB to 16MB and avoids
long hangs on my Cubietruck under IO. acorn26 is kept as it does

Use default PAGER_MAP_DEFAULT_SIZE for ARM and PowerPC, exception
acorn26. This bumps the KVA reservation from 4MB to 16MB and avoids
long hangs on my Cubietruck under IO. acorn26 is kept as it does have a
ridiculous low 32MB KVA limit.

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expose more for kmemuser

Remove incomplete, never worked dynamic run-time memory registration
(uvm_page_physload(9)). This functionality will be re-added later.

defparam PAGER_MAP_SIZE.

Zaurus Port from OpenBSD by Nonaka Kimihiro
OK gimpy