Add support for Renesas RZ/N1 platform

Add support for RZ/N1 platform from Renasas (PLATFORM=rzn1):
- Cortex-A7 based dual core processor.

This platform supports TrustZone based IO register access

Add support for Renesas RZ/N1 platform

Add support for RZ/N1 platform from Renasas (PLATFORM=rzn1):
- Cortex-A7 based dual core processor.

This platform supports TrustZone based IO register access control, so
add corresponding OEM service based implementation.

Link: https://www.renesas.com/us/en/products/microcontrollers-microprocessors/rz/rzn/rzn1d.html
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Acked-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

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