rockchip: odroid-go2: Update Kconfig options for SPL

rockchip: odroid-go2: Update Kconfig options for SPL

Drop SPL_DRIVERS_MISC, it is not needed/used on these devices.

Enable SPL_FIT_SIGNATURE to ensure the integrity of the FIT images
that are loaded into memory.

Change SPL_MAX_SIZE to 256 KiB, similar to other SoCs where TF-A is
loaded at 0x40000 offset from start of DRAM.

Enable SPL_DM_SEQ_ALIAS to ensure device aliases are applied in SPL.

Drop use of SPL_TINY_MEMSET, there is plenty room for the normal memset.

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