HSI: hsi_char: Add HSI char device kernel configuration

Add HSI character device kernel configuration

Signed-off-by: Andras Domokos <andras.domokos@nokia.com>
Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com>
diff --git a/drivers/hsi/Makefile b/drivers/hsi/Makefile
index ed94a3a..9d5d33f 100644
--- a/drivers/hsi/Makefile
+++ b/drivers/hsi/Makefile
@@ -3,3 +3,4 @@
 #
 obj-$(CONFIG_HSI_BOARDINFO)	+= hsi_boardinfo.o
 obj-$(CONFIG_HSI)		+= hsi.o
+obj-y				+= clients/