rockchip: rk3328-roc-cc: Update defconfig

Update defconfig for rk3328-roc-cc with new defaults.

Remove the SPL_DRIVERS_MISC=y option, no misc driver is used in SPL.

Add CONFIG_SPL_FIT_SIGNATURE=y to let SPL verify an auto generated hash
of FIT images. This help indicate if there is an issue loading any of
the images to DRAM or SRAM. Also add LEGACY_IMAGE_FORMAT=y to keep
support for scripts.

Remove SPL_I2C=y and SPL_PMIC_RK8XX=y, the related i2c and pmic nodes is
not included in the SPL fdt.

Add CMD_GPIO=y and CMD_REGULATOR=y to add the helpful gpio and regulator
commands. Also add CMD_POWEROFF=y to be able to use the poweroff command.

Add ROCKCHIP_EFUSE=y and remove NET_RANDOM_ETHADDR=y, ethaddr and
eth1addr is set based on cpuid read from eFUSE.

Add SPL_DM_SEQ_ALIAS=y option to use alias sequence number in SPL.

Add DM_ETH_PHY=y, PHY_MOTORCOMM=y and PHY_REALTEK=y to support common
ethernet PHYs.

Remove REGULATOR_PWM=y, the pwm-regulator compatible is not used.

Add RNG_ROCKCHIP=y and DM_RNG=y options to support the onboard random
generator.

Also add missing device tree file to MAINTAINERS and add myself as a
reviewer for this board.

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