stm32mp1: add support for LpDDR3

This change enables LpDDR3 initialization with PMIC.

Change-Id: I2409a808335dfacd69a8517cb8510cee98bb8161
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/drivers/st/pmic/stm32mp_pmic.c b/drivers/st/pmic/stm32mp_pmic.c
index 6fe51f4..9e9dddc 100644
--- a/drivers/st/pmic/stm32mp_pmic.c
+++ b/drivers/st/pmic/stm32mp_pmic.c
@@ -299,6 +299,7 @@
 		break;
 
 	case STM32MP_LPDDR2:
+	case STM32MP_LPDDR3:
 		/*
 		 * Set LDO3 to 1.8V
 		 * Set LDO3 to bypass mode if BUCK3 = 1.8V