Update profiles to reflect new pointer-masking extensions #131
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There is no longer such an extension. When the RVM23 profile is extended to describe the privileged architecture, Ssnpm/Smnpm/Smmpm could be re-added.
As a first cut, mandate PMLEN=7 only, to avoid circuit-delay implications when targeting Sv57.
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Strip Zjpm from RVM, since RVM currently only defines the U-mode architecture, but S- or M-mode is needed to define pointer masking.
Update RVA23 to require Ssnpm with PMLEN=7 (see #130 for discussion).
Update RVB23 to make Ssnpm optional.
Resolves #130