plat-sam: add support for Microchip sama7g54-ek board

Add the main functions for sama7g54 initialize, including:
- console_init()
- Matrix, TZC, TZPM, interrupt related
Update conf.mk and Makefile

plat-sam: add support for Microchip sama7g54-ek board

Add the main functions for sama7g54 initialize, including:
- console_init()
- Matrix, TZC, TZPM, interrupt related
Update conf.mk and Makefile for sama7g5 OP-TEE support.

Signed-off-by: Tony Han <tony.han@microchip.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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