[PATCH 2.5.65] update md driver to new module API

This patch updates the md driver and personalities to the new
module interfaces.

An owner field has been added to the struct mdk_personality_s.
This is initialized by each personality module.  The md driver
now attempts to take a reference to the personality before calling
the personality's run routine.  A pers_lock was added to protect 
the setting, clearing and reading of pers[] entries. This protects
try_module_get() racing with unregister_md_personality().

I have tested each personality as a module.

-- 
Daniel McNeil <daniel@xxxxxxxx>

patch-2.5.65-md
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