Merge changes I5aabe415,Ief6fb4fc into integration

* changes:
feat(stm32mp15-fdts): add SP_MIN versions of DT files
feat(st): use dedicated version of DT for SP_MIN

feat(stm32mp15-fdts): add SP_MIN versions of DT files

For ST STM32MP15 boards, where the default BL32 is OP-TEE, we add new
versions of DT files with -sp_min.dts extension to manage this
configurati

feat(stm32mp15-fdts): add SP_MIN versions of DT files

For ST STM32MP15 boards, where the default BL32 is OP-TEE, we add new
versions of DT files with -sp_min.dts extension to manage this
configuration. These files can be compiled directly, or, with the
previous patch, the same command line can be used and those sp_min
files will be automatically used, if AARCH32_SP=sp_min option is used.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I5aabe415b0302da48f02918a3dbd24f334eb8e7d

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