plat-sam: enable PSCI_ARM32, ATMEL_SHDWC and ATMEL_RSTC

Enable config PSCI_ARM32, ATMEL_SHDWC and ATMEL_RSTC to implement
basic PSCI support. Force enable PSCI_ARM32 but allow other options
to be mo

plat-sam: enable PSCI_ARM32, ATMEL_SHDWC and ATMEL_RSTC

Enable config PSCI_ARM32, ATMEL_SHDWC and ATMEL_RSTC to implement
basic PSCI support. Force enable PSCI_ARM32 but allow other options
to be modified if shutdown and reset is not needed.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Clément Léger <clement.leger@bootlin.com>

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