Merge tag 'mips-pull-2019-04-12' of git://git.denx.de/u-boot-mips

- mt76xx: add USB support, small fixes
- ath79: small fixes, add support for QCA9563 SoC and AP152 reference board
- mscc: small fixes, add network support for JR2 and ServalT SoCs
- bmips: small fixes, enable more drivers for ARM specific BCM6858 and BCM63158 SoCs
- MIPS: fix redundant relocation of initrd images