plat-stm32mp1: enable support for regulators

Enables regulator framework on platform stm32mp1.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

core/arch/arm/plat-stm32mp1/conf.mk

@@ -95,6 +95,7 @@ $(call force,CFG_DRIVERS_CLK,y)
 $(call force,CFG_DRIVERS_CLK_DT,y)
 $(call force,CFG_DRIVERS_GPIO,y)
 $(call force,CFG_DRIVERS_PINCTRL,y)
+$(call force,CFG_DRIVERS_REGULATOR,y)
 $(call force,CFG_GIC,y)
 $(call force,CFG_INIT_CNTVOFF,y)
 $(call force,CFG_PSCI_ARM32,y)