UniPhier SoC updates for v2020.04 (2nd) Denali NAND driver changes: - Set up more registers in denali-spl for SOCFPGA - Make clocks optional - Do not assert reset signals in the remove hook - associate SPARE_AREA_SKIP_BYTES with DT compatible - switch to UCLASS_MTD UniPhier platform changes: - fix a bug in dram_init() - specify loadaddr for "source" command