ARM: stm32: restore reboot capabilities

To be able to reboot the platform we need to use armv7m_restart for STM32
SoCs using ARMv7 cores.

Fixes: e0644101bd2f ("ARM: mach-stm32: prepare stm32 family to welcome armv7 architecture)
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/mach-stm32/board-dt.c

@@ -7,6 +7,9 @@
 
 #include <linux/kernel.h>
 #include <asm/mach/arch.h>
+#ifdef CONFIG_ARM_SINGLE_ARMV7M
+#include <asm/v7m.h>
+#endif
 
 static const char *const stm32_compat[] __initconst = {
 	"st,stm32f429",
@@ -20,4 +23,7 @@ static const char *const stm32_compat[] __initconst = {
 
 DT_MACHINE_START(STM32DT, "STM32 (Device Tree Support)")
 	.dt_compat = stm32_compat,
+#ifdef CONFIG_ARM_SINGLE_ARMV7M
+	.restart = armv7m_restart,
+#endif
 MACHINE_END