FMC: create drivers/fmc and toplevel Kconfig question

This commit creates the drivers/fmc directory and puts the necessary
hooks for kbuild and kconfig.  The code is currently a placeholder
that only registers an empty bus.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Juan David Gonzalez Cobas <dcobas@cern.ch>
Acked-by: Emilio G. Cota <cota@braap.org>
Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc MAINTAINERS
Simple merge

diff --cc drivers/Kconfig
Simple merge

diff --cc drivers/Makefile
Simple merge

diff --cc drivers/fmc/Kconfig
Simple merge

diff --cc drivers/fmc/Makefile
Simple merge

diff --cc drivers/fmc/fmc-core.c
Simple merge