Revert "stm32mp1: remove the imply BOOTSTAGE"

This reverts the workaround introduced by the
commit 16fec9b0bc1a ("stm32mp1: remove the imply BOOTSTAGE")
As the bootstage alignment issue is now solved.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
index 7b86ce1..ba965e7 100644
--- a/arch/arm/mach-stm32mp/Kconfig
+++ b/arch/arm/mach-stm32mp/Kconfig
@@ -63,7 +63,9 @@
 	bool "STMicroelectronics STM32MP15x boards"
 	select STM32MP15x
 	imply BOOTCOUNT_LIMIT
+	imply BOOTSTAGE
 	imply CMD_BOOTCOUNT
+	imply CMD_BOOTSTAGE
 	imply CMD_CLS if CMD_BMP
 	imply DISABLE_CONSOLE
 	imply PRE_CONSOLE_BUFFER