In v2018 the patch
"dm: ahci: Correct uclass private data"
(sha1: bfc1c6b483)
was causing an issue for ceva_sata.
But this issue is not in v2018.05-rc1 but still converting to
UCLASS_AHCI would make more sense.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>