stm32mp: stm32prog: Add CONFIG_CMD_STM32PROG_SERIAL and _USB

Add CONFIG_CMD_STM32PROG_SERIAL and CONFIG_CMD_STM32PROG_USB to
independently select the support of UART or USB communication for
STM32CubeProgrammer.

For serial boot over UART, user can deactivate CONFIG_CMD_STM32PROG_SERIAL
to use U-Boot console of binary loaded by UART (for board bring-up for
example).

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/arch/arm/mach-stm32mp/cmd_stm32prog/Kconfig b/arch/arm/mach-stm32mp/cmd_stm32prog/Kconfig
index 609a678..f4c0d18 100644
--- a/arch/arm/mach-stm32mp/cmd_stm32prog/Kconfig
+++ b/arch/arm/mach-stm32mp/cmd_stm32prog/Kconfig
@@ -11,8 +11,24 @@
 	imply DFU_MTD if MTD
 	help
 		activate a specific command stm32prog for STM32MP soc family
-		witch update the device with the tools STM32CubeProgrammer,
-		using UART with STM32 protocol or USB with DFU protocol
+		witch update the device with the tools STM32CubeProgrammer
 		NB: access to not volatile memory (NOR/NAND/SD/eMMC) is based
 		    on U-Boot DFU framework
 
+config CMD_STM32PROG_USB
+	bool "support stm32prog over USB"
+	depends on CMD_STM32PROG
+	default y
+	help
+		activate the command "stm32prog usb" for STM32MP soc family
+		witch update the device with the tools STM32CubeProgrammer,
+		using USB with DFU protocol
+
+config CMD_STM32PROG_SERIAL
+	bool "support stm32prog over UART"
+	depends on CMD_STM32PROG
+	default y
+	help
+		activate the command "stm32prog serial" for STM32MP soc family
+		with the tools STM32CubeProgrammer using U-Boot serial device
+		and UART protocol.
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