rockchip: rk3399: Enable ARMv8 crypto and FIT checksum validation

rockchip: rk3399: Enable ARMv8 crypto and FIT checksum validation

The RK3399 SoC support the ARMv8 Cryptography Extensions, use of ARMv8
crypto can speed up FIT checksum validation in SPL.

Imply ARMV8_SET_SMPEN and ARMV8_CRYPTO to take advantage of the crypto
extensions for SHA256 when validating checksum of FIT images.

Imply SPL_FIT_SIGNATURE and LEGACY_IMAGE_FORMAT to enable FIT checksum
validation to almost all RK3399 boards.

The following boards have been excluded:
- chromebook_bob: SPL max size limitation of 120 KiB
- chromebook_kevin: SPL max size limitation of 120 KiB

Also imply OF_LIVE to help speed up init of U-Boot proper and disable
CONFIG_SPL_RAW_IMAGE_SUPPORT on leez-rk3399 to ensure SPL does not try
to jump to code that failed checksum validation.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>