stm32mp1: ram: add tuning in DDR interactive mode

Add command tuning for DDR interactive mode, used during
board bring-up or with CubeMX DDR tools to execute software
tuning for the DDR configuration:
- software read DQS Gating (replace the built-in one)
- Bit de-skew
- Eye Training or DQS training

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/drivers/ram/stm32mp1/Makefile b/drivers/ram/stm32mp1/Makefile
index 71ded6b..e1e9135 100644
--- a/drivers/ram/stm32mp1/Makefile
+++ b/drivers/ram/stm32mp1/Makefile
@@ -8,6 +8,7 @@
 
 obj-$(CONFIG_STM32MP1_DDR_INTERACTIVE) += stm32mp1_interactive.o
 obj-$(CONFIG_STM32MP1_DDR_TESTS) += stm32mp1_tests.o
+obj-$(CONFIG_STM32MP1_DDR_TUNING) += stm32mp1_tuning.o
 
 ifneq ($(DDR_INTERACTIVE),)
 CFLAGS_stm32mp1_interactive.o += -DCONFIG_STM32MP1_DDR_INTERACTIVE_FORCE=y