Merge tag 'xilinx-for-v2017.07' of git://www.denx.de/git/u-boot-microblaze

Xilinx changes for v2017.07

ZynqMP:
- config cleanup
- SD LS mode support
- psu_init* cleanup
- unmap OCM
- Support for SMC

Zynq:
- add ddrc to Kconfig
- add topic-miamilite board support