[coreboot] device cleanup and printing fixes

[Myles Watson]

This patch adds some debug functions, cleans up whitespace (per indent), and
adds const in a few places.

include/device/path.h
    Make path_eq take const path*.

include/device/device.h
    Use const with dev_path, dev_id_string, bus_path, find_dev_path,
    andalloc_find.

device/device.c
    Add functions for tree printing of devs and resources.
    Change %p to more useful info.

device/device_util.c
    Use const changes from device.h.

lib/stage2.c
    Use updated printing functions.

Signed-off-by: Myles Watson

Build tested on qemu, norwich, and serengeti.  Boot tested on Serengeti.

Thanks,
Myles