configs: Add rk3568-spi-nand(-pmic).config

These two files are mainly for generating the uboot.img as small as possible,
in order to run on the spi-nand board with critial capacity(128MB now).

And

configs: Add rk3568-spi-nand(-pmic).config

These two files are mainly for generating the uboot.img as small as possible,
in order to run on the spi-nand board with critial capacity(128MB now).

And the preloader is Miniloader for the small size too. Therefore we have to
use the legacy image format: uboot.img and trust.img.

Update rk3568-spi-nand(-pmic).config according to .config:
./scripts/sync-fragment.sh configs/rk3568-spi-nand-pmic.config
./scripts/sync-fragment.sh configs/rk3568-spi-nand.config

The commands to reduce uboot size to 815K for spi nand product:
./make.sh rk3568-spi-nand --sz-uboot 1024 2 --sz-trust 512 2 for not pmu product or
./make.sh rk3568-spi-nand-pmic --sz-uboot 1024 2 --sz-trust 512 2 for pmu product

Signed-off-by: zhijun.xie <xzj@rock-chips.com>
Change-Id: Ib4923a00dc4a97909d1000a1b5b6023a7e5b3681

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