plat-stm32mp1: SiP SMC service for BSEC access

Implement a SiP SMC based interface fàr the non-secure world to access
BSEC words. The service is embedded upon CFG_STM32_BSEC_SIP=y. If not
embedded,

plat-stm32mp1: SiP SMC service for BSEC access

Implement a SiP SMC based interface fàr the non-secure world to access
BSEC words. The service is embedded upon CFG_STM32_BSEC_SIP=y. If not
embedded, the service simply reports a failure.

This service is used by U-boot package since its release v2019.07-rc1 [1]
to retrieve information such as the device MAC address [2].

Link: [1] https://github.com/u-boot/u-boot/blob/v2019.07-rc1/arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h
Link: [2] https://github.com/u-boot/u-boot/blob/v2019.07-rc1/arch/arm/mach-stm32mp/cpu.c#L475

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

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