stm32mp1: add support for stm32mp157c-ev1 board

Add support of stm32mp157c-ev1, the evaluation board with pmic stpmu1
(ev1 = mother board + daughter ed1) with device tree.
EV1 is the selected board by default in basic defconfig.

PS: CONFIG_PINCTRL_FULL activation avoid to increase
    SYS_MALLOC_F_LEN (Early malloc usage: 2034)

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 016c54d..09adf5e 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -541,7 +541,8 @@
 dtb-$(CONFIG_ARCH_STI) += stih410-b2260.dtb
 
 dtb-$(CONFIG_TARGET_STM32MP1) += \
-	stm32mp157c-ed1.dtb
+	stm32mp157c-ed1.dtb \
+	stm32mp157c-ev1.dtb
 
 targets += $(dtb-y)