x86/vpmu: Improve documentation and parsing for vpmu=

x86/vpmu: Improve documentation and parsing for vpmu=

The behaviour of vpmu=<bool> being exclusive of vpmu=bts|ipc|arch is odd and
contrary to Xen's normal command line parsing behaviour.  Rewrite the parsing
to use the normal form, but retain the previous behaviour where the use of
bts/ipc/arch implies vpmu=true.

Parts of the documenation are stale, most notibly the HVM-only statement.
Update it for consistency and correctness.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Release-acked-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>