plat-altera: introduce SoCFPGA platform support

Add initial support for the SoCFPGA platform under plat/altera.

This commit introduces the basic platform skeleton, including build
configuration, pl

plat-altera: introduce SoCFPGA platform support

Add initial support for the SoCFPGA platform under plat/altera.

This commit introduces the basic platform skeleton, including build
configuration, platform initialization entry points, and configuration
headers required for bring-up.

Signed-off-by: Jit Loon Lim <jit.loon.lim@altera.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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