dm: core: Add SPL Kconfig for REGMAP and SYSCON

Add SPL Kconfig for REGMAP and SYSCON, so REGMAP and SYSCON can
remove from SPL stage.

Signed-off-by: Lin Huang <hl@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/Kconfig b/drivers/core/Kconfig
index 15681df..ac68172 100644
--- a/drivers/core/Kconfig
+++ b/drivers/core/Kconfig
@@ -72,6 +72,16 @@
 	  support any bus type (I2C, SPI) but so far this only supports
 	  direct memory access.
 
+config SPL_REGMAP
+	bool "Support register maps in SPL"
+	depends on DM
+	help
+	  Hardware peripherals tend to have one or more sets of registers
+	  which can be accessed to control the hardware. A register map
+	  models this with a simple read/write interface. It can in principle
+	  support any bus type (I2C, SPI) but so far this only supports
+	  direct memory access.
+
 config SYSCON
 	bool "Support system controllers"
 	depends on REGMAP
@@ -81,6 +91,15 @@
 	  by this uclass, including accessing registers via regmap and
 	  assigning a unique number to each.
 
+config SPL_SYSCON
+	bool "Support system controllers in SPL"
+	depends on REGMAP
+	help
+	  Many SoCs have a number of system controllers which are dealt with
+	  as a group by a single driver. Some common functionality is provided
+	  by this uclass, including accessing registers via regmap and
+	  assigning a unique number to each.
+
 config DEVRES
 	bool "Managed device resources"
 	depends on DM