Integrate u-boot-seco-rk/seco_2017.09_next_logo

Commit: https://git.seco.com/edgehog/bsp/rockchip/u-boot-seco-rk/-/commit/cc1d6744e9fe5a9155320c99f8dc3f3df784a46e

[DRM][LOGO] Avoid usage of flush_dcache_range

For some reason, probably related to cache alignment issues, flush_dcache_range sometimes crashes. To avoid this, we use flush_dcache_all() which invalidates the entire dcache, but never crashes.