FMC: add a software mezzanine driver

This simple do-nothing mezzanine driver shows how to write a mezzanine
driver, that can also handle interrupts reported by the carrier.

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 --git a/drivers/fmc/Makefile b/drivers/fmc/Makefile
index 9832b79..52624e6 100644
--- a/drivers/fmc/Makefile
+++ b/drivers/fmc/Makefile
@@ -8,3 +8,4 @@
 fmc-y += fmc-dump.o
 
 obj-$(CONFIG_FMC_FAKEDEV) += fmc-fakedev.o
+obj-$(CONFIG_FMC_TRIVIAL) += fmc-trivial.o