Provide macros to extract the sub-fields of the CAP_LO and CAP_HI registers.

[imp]

Summary

These macros make places where we extract these easier to read. The shift and
mask stuff is also a bit tedious and error prone. Start with the CAP_LO and
CAP_HI registers since their scope is somewhat constrained. This is style
chagne only, no functional changes.

[chuck]

LGTM