spl: add SPL_RESET_SUPPORT

Add option to include RESET driver and uclass in SPL.
That can be useful to handle IP reset with same driver
in U-Boot and in SPL.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/drivers/Makefile b/drivers/Makefile
index 2673428..6846d18 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -29,6 +29,7 @@
 obj-$(CONFIG_ALTERA_SDRAM) += ddr/altera/
 obj-$(CONFIG_SPL_POWER_SUPPORT) += power/ power/pmic/
 obj-$(CONFIG_SPL_POWER_SUPPORT) += power/regulator/
+obj-$(CONFIG_SPL_RESET_SUPPORT) += reset/
 obj-$(CONFIG_SPL_MTD_SUPPORT) += mtd/
 obj-$(CONFIG_SPL_ONENAND_SUPPORT) += mtd/onenand/
 obj-$(CONFIG_SPL_UBI) += mtd/ubispl/