Merge tag 'mips-pull-2021-04-24' of https://source.denx.de/u-boot/custodians/u-boot-mips

- MIPS: octeon: fix minor bugs of initial merge
- MIPS: octeon: add support for QLM and PCI-E controller
- MIPS: octeon: add support for AHCI and SATA
- MIPS: octeon: add E1000 ethernet support
- MIPS: octeon: add Octeon III NIC23 board
- ata/scsi: add support for Big Endian platforms