plat-rockchip: split platform_init for ddr region protection

rk322x currently expects to be loaded from U-Boot-SPL directly and defines
one platform service to initialize security settings for its p

plat-rockchip: split platform_init for ddr region protection

rk322x currently expects to be loaded from U-Boot-SPL directly and defines
one platform service to initialize security settings for its purposes.

On all future platforms we will want to approach this differently in that
OP-TEE gets started out of Trusted Firmware which in turn already should
have done core security settings and inside OP-TEE we will only want to
protect OP-TEEs memory region against non-secure access.

So create a general service calling into a flavor-specific function to
protect the memory region but also leave rk322x its special init functon.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Acked-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Jerome Forissier <jerome@forissier.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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