drivers: misc: add Gateworks System Controller driver

Add a driver for the Gateworks System Controller used on Gateworks boards
which provides a boot watchdog, power control, temperature monitor,
and voltage ADCs.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index f22eff6..6150d01 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -38,6 +38,7 @@
 obj-$(CONFIG_FSL_MC9SDZ60) += mc9sdz60.o
 obj-$(CONFIG_FSL_SEC_MON) += fsl_sec_mon.o
 obj-$(CONFIG_$(SPL_)FS_LOADER) += fs_loader.o
+obj-$(CONFIG_GATEWORKS_SC) += gsc.o
 obj-$(CONFIG_GDSYS_IOEP) += gdsys_ioep.o
 obj-$(CONFIG_GDSYS_RXAUI_CTRL) += gdsys_rxaui_ctrl.o
 obj-$(CONFIG_GDSYS_SOC) += gdsys_soc.o