Re: dtc: Improve and better integrate dtc and libfdt Makefiles

So, like, the other day David Gibson mumbled:

This patch substantially revamps the dtc Makefiles, in particular
better integrating the Makefile for dtc proper with the Makefiles
imported from libfdt for libfdt and the shared testsuite.  Notable
changes:
	- No recursive make calls.  Instead subsidiary Makefiles are
included into the top-level Makefile so we get a complete dependency
information.
	- Common pattern rules, CFLAGS etc. shared between dtc, libfdt
and testsuite, rather than separate copies.
	- Vaguely Kbuild-like non-verbose mode used by default, which
makes warnings more prominent.
	- libfdt Makefile consists only of variable definitions and
helper rules, to make it more easily embeddable into other Makefile
systems.

Signed-off-by: David Gibson <redacted>

I like.

Applied.

Thanks!
jdl