rockchip: rk3328-evb: Update defconfig

Update defconfig for rk3328-evb with new defaults.

Add DM_RESET=y to support using reset signals.

Remove the xPL_DRIVERS_MISC=y option, no misc driver is used in xPL.

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.

Add CMD_GPIO=y and CMD_REGULATOR=y to add the helpful gpio and regulator
commands.

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

Remove pinctrl-0 and pinctrl-names from CONFIG_OF_SPL_REMOVE_PROPS,
SPL need to configure pinctrl for e.g. SD-card.

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.

Add SYSINFO=y to support the sysinfo uclass.

Also add missing device tree files to MAINTAINERS and remove the
obsolete README file.

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