refactor(fdts stm32mp1): move STM32MP DDR node

Move the generic part of DDR node in SOC dtsi file.
DDR dtsi files only include the part configured by CubeMX tool.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@foss.st.com>
Change-Id: I8c211e9782604da32aeaab98d0ef75fb1cd9c58d
2 files changed