stm32mp1: device tree platform description

This change introduces the device tree source files describing boards
EV1 and ED1 and the related bindings.

The stm32mp1 DTS files and bindings header fil

stm32mp1: device tree platform description

This change introduces the device tree source files describing boards
EV1 and ED1 and the related bindings.

The stm32mp1 DTS files and bindings header files are dumped from
latest Linux kernel (v4.19). Bindings documentation is not stored in
OP-TEE OS source tree, one shall refer to the bindings documentation
from latest Linux kernel source tree.

Note that license terms where changed for binding header file gpio.h
to release them under dual 2-Clause DSB/GPLv2.0 instead of GPLv2.0 as
release in the Linux kernel.

Platform relies on DT source file (CFG_EMBED_DTB_SOURCE_FILE) to
distinguish between the platform flavors for the few configuration
directive that are static and cannot be provided only through FDT.

Default configuration locates the secure DDR area (TZDRAM) from
the base address of the last 32MBytes of the DDR over 30Mbyte.
The last 2MBytes of the DDR are the OP-TEE static shared memory.

Many contributors not listed below.

Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>

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