power: spl: add SPL_DM_REGULATOR_GPIO in Kconfig

The Makefile already tests for SPL_DM_REGULATOR_GPIO, but Kconfig
does not provide it. This adds SPL_DM_REGULATOR_GPIO to Kconfig.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index 414f4a5..2561a8a 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -86,12 +86,19 @@
 
 config DM_REGULATOR_GPIO
 	bool "Enable Driver Model for GPIO REGULATOR"
-	depends on DM_REGULATOR
+	depends on DM_REGULATOR && DM_GPIO
 	---help---
 	This config enables implementation of driver-model regulator uclass
 	features for gpio regulators. The driver implements get/set for
 	voltage value.
 
+config SPL_DM_REGULATOR_GPIO
+	bool "Enable Driver Model for GPIO REGULATOR in SPL"
+	depends on DM_REGULATOR_GPIO && SPL_GPIO_SUPPORT
+	---help---
+	This config enables implementation of driver-model regulator uclass
+	features for gpio regulators in SPL.
+
 config REGULATOR_RK8XX
 	bool "Enable driver for RK8XX regulators"
 	depends on DM_REGULATOR && PMIC_RK8XX