Revert "stm32mp1: remove the imply BOOTSTAGE"

This reverts the workaround introduced by the
commit 16fec9b0 ("stm32mp1: remove the imply BOOTSTAGE")
As the bootstage alignment issue is now solved.
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>

arch/arm/mach-stm32mp/Kconfig

@@ -63,7 +63,9 @@ config TARGET_ST_STM32MP15x
 	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