dev/arm: get rid of AmbaDev namespace

It was confusing having an AmbaDev namespace along with an
AmbaDevice class. The namespace stuff is now moved in to
a new base AmbaDevice class, which is a mixin for classes
AmbaPioDevice (the former AmbaDevice) and AmbaDmaDevice
to provide the readId function as an inherited member function.

Committed by: Nilay Vaish <nilay@cs.wisc.edu>

AddrRange: Transition from Range<T> to AddrRange

This patch takes the final plunge and transitions from the templated
Range class to the more specific AddrRange. In doing so it changes the
obvious Range<Addr> to AddrRange, and also bumps the range_map to be
AddrRangeMap.

In addition to the obvious changes, including the removal of redundant
includes, this patch also does some house keeping in preparing for the
introduction of address interleaving support in the ranges. The Range
class is also stripped of all the functionality that is never used.

ARM: Add I/O devices for booting linux