(Reuters) -British sprinter Chijindu Ujah was banned by the Athletics Integrity Unit (AIU) for 22 months on Monday for a doping violation at last year’s Tokyo Olympics but cleared him of intentionally taking prohibited substances. Ujah was provisionally suspended after Ostarine and S-23 — substances prohibited by the World Anti-doping Agency (WADA) — were detected in his A and B samples following the men’s 4x100m relay final in which Britain finished second behind Italy. The AIU, which oversees integrity issues in international athletics including doping, added that the ban was effective fro…