unfortunately your controller (Host Controllers, SiI3531, SiI3132, SiI3124, SiI3114) isn't supported ...
some people on the community was able to get this working with 5.1GA release (ESXi 5.1.0 GA, 2012-09-10,799733):
so it seems that only way is to go back to 5.1GA release ...
you may also want to check out this post:
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