Merge https://source.denx.de/u-boot/custodians/u-boot-riscv

Makefile

arch/riscv/cpu/generic/Kconfig

arch/riscv/dts/Makefile

arch/riscv/dts/ae350_32.dts

arch/riscv/dts/ae350_64.dts

arch/riscv/dts/binman.dtsi

arch/riscv/dts/hifive-unleashed-a00-u-boot.dtsi

arch/riscv/dts/qemu-virt.dts

arch/riscv/lib/mkimage_fit_opensbi.sh

board/AndesTech/ax25-ae350/Kconfig

board/sifive/unleashed/Kconfig

common/Kconfig.boot

configs/ae350_rv32_spl_defconfig

configs/ae350_rv32_spl_xip_defconfig

configs/ae350_rv64_spl_defconfig

configs/ae350_rv64_spl_xip_defconfig

configs/qemu-riscv32_spl_defconfig

configs/qemu-riscv64_spl_defconfig

dts/Kconfig

lib/Kconfig