stm32mp1: ram: add tests in DDR interactive mode

Add command tests for DDR interactive mode, used during
board bring-up or with CubeMX DDR tools to verify the
DDR configuration.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/drivers/ram/stm32mp1/Kconfig b/drivers/ram/stm32mp1/Kconfig
index 511eaf2..4e682b4 100644
--- a/drivers/ram/stm32mp1/Kconfig
+++ b/drivers/ram/stm32mp1/Kconfig
@@ -29,3 +29,11 @@
 		skip the polling of character 'd' in console
 		useful when SPL is loaded in sysram
 		directly by programmer
+
+config STM32MP1_DDR_TESTS
+	bool "STM32MP1 DDR driver : tests support"
+	depends on STM32MP1_DDR_INTERACTIVE
+	default y
+	help
+		activate test support for interactive support in
+		STM32MP1 DDR controller driver: command test