clock: Move typedefs below clock plat header

On gcc6, the compiler complains that the typedef'ing of enums before
its definition isn't allowed. We fix this by positioning the enums right
after the clock plat headers which is where the enums are defined.

trivial: Style changed files

libplatsupport: Typedef some clock-related types

The types are typedef'd to allow CAmkES to use these types in IDL4
interface files.

pragma once and for all

Fix whitespace

- remove trailing whitespace
- remove duplicate blank lines
- remove blank lines at end of file

fix licenses

libutils: Added frequency.h to libutils

This defines some macros for converting between frequency, time and
cycles, some frequency unit conversions, and a typedef for freq_t.