pta: stm32mp: add BSEC PTA

Add BSEC PTA to offer an interface with One Time Programmed resources
(OTPs) of stm32mp1x platforms.

This interface allows non-secure world clients to get the state of
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pta: stm32mp: add BSEC PTA

Add BSEC PTA to offer an interface with One Time Programmed resources
(OTPs) of stm32mp1x platforms.

This interface allows non-secure world clients to get the state of
the BSEC, and read and write the OTPs. The REE has restricted
access on OTPs, the policy is defined in the embedded DT.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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