fdts: stm32mp1: update BL32/BL32_DT load address

Invert position of BL32 and BL32_DT in memory, otherwise the BL32
BSS initialization overwrote DT area. With this inversion BL32 BSS
overwrite a no more used memory area.

Signed-off-by: Nicolas Toromanoff <nicolas.toromanoff@st.com>
Change-Id: I0a8cd0c64921d2813be4b31212510f53caea9158
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/tf-a/+/184834


Reviewed-by: CITOOLS <smet-aci-reviews@lists.codex.cro.st.com>
Reviewed-by: CIBUILD <smet-aci-builds@lists.codex.cro.st.com>
Reviewed-by: Yann GAUTIER <yann.gautier@st.com>