arch: riscv: jh7110: fix qspi partitions according to datasheet
requested to merge github/fork/vali-um/JH7110_Visionfive2_devel_qspi_dts into JH7110_VisionFive2_devel
Created by: vali-um
alternative to #91 to fix the qspi flash layout.
- put uboot-env after uboot partition to keep /dev/mtd1 the u-boot partiton for updates
- just the partitions on the datasheet, not the full flash