Merge tag 'arc-for-2019.10-rc4' of https://gitlab.denx.de/u-boot/custodians/u-boot-arc

These are some very late changes mostly required to get 64-bit
division working on ARC boards.

For that we had to import missing parts of libgcc and add compiler
flags to EMSDP which otherwise used very simple profile for compliation.

And while at it another fix for EM SDP initialization is inluded as well.