feat(st-drivers): add Memory Cipher Engine driver

Memory Cipher Engine (MCE) defines, in a given address space, one region
with specific security setup (encryption).
FCONF compliance ensures region

feat(st-drivers): add Memory Cipher Engine driver

Memory Cipher Engine (MCE) defines, in a given address space, one region
with specific security setup (encryption).
FCONF compliance ensures region definition through DT.

Change-Id: I1bca9c0a89af88a72651e1a71e3f8950807eec40
Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
Signed-off-by: Maxime Méré <maxime.mere@foss.st.com>

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