Begin promoting the AMD-originated feature flags to first class flags, now

that newer Intel cpu hardware implements them too.  This includes things
like the NX (pte no-execute) flag for execute protection.  We'll need to
reference this for implementing no-exec in pmap.c at some point.

Some feature flags are duplicated in both the Intel-orignated bits and
the AMD bits.  Suppress the the duplicates correctly - the old code
assumed they were a 1:1 mapping which is not correct.  We can't just mask
off the bits present in cpu_feature.

Converge with amd64 where this originated from.

Intel cpu's that implement any AMD features will report them in dmesg now.

Approved by:	re

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