Merge tag 'u-boot-rockchip-20190823' of https://gitlab.denx.de/u-boot/custodians/u-boot-rockchip

- remove rk3288 fennec board
- remove SPL raw image support for Rockchip SoCs
- add common misc_init_r() for ethaddr from cpuid
- enable USB HOST support for rk3328
- unify code for finding a valid gpt in part driver