IOAPIC: hook up driver in Kconfig

Missed to add the driver to Kconfig and Makefile.inc.

Change-Id: I64b02abc5de2f6483f610436ebb38a7ca433f9b6
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-on: http://review.coreboot.org/1219
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/src/drivers/generic/Kconfig b/src/drivers/generic/Kconfig
index fbbfeb1..597a186 100644
--- a/src/drivers/generic/Kconfig
+++ b/src/drivers/generic/Kconfig
@@ -1,3 +1,3 @@
 source src/drivers/generic/debug/Kconfig
 source src/drivers/generic/generic/Kconfig
-
+source src/drivers/generic/ioapic/Kconfig
diff --git a/src/drivers/generic/Makefile.inc b/src/drivers/generic/Makefile.inc
index 08e6cc5..802aac0 100644
--- a/src/drivers/generic/Makefile.inc
+++ b/src/drivers/generic/Makefile.inc
@@ -1,2 +1,3 @@
 subdirs-y += debug
 subdirs-y += generic
+subdirs-y += ioapic