feat(stm32mp2): enable DDR driver

Call stm32mp2_ddr_probe() function in platform setup.
Move DDR systematic test file in common.mk.

Change-Id: I982abd33635a3222a52c967eac64676bc26b0d6b
Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
1 file changed