nfs4: simplify aceflag4 acemask4 acetype4 classes

Motivation:
The values use by aceflag4, acemask4 and acetype4 are wrapped by uint32_t
ints.

Modification:
Simplify aceflag4, acemask4 and acetype4 by dropping extra uint32 wrapper.

Result:
less work for GC.

Acked-by: Paul Millar
Acked-by: Lea Morschel
Target: master
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