Hi Kulbhushan,
Please note that there are two Linux releases: official Freescale BSPs (which we [TIC] support) and Community BSPs (which we do not support, it is supported through Community or Yocto mailing list: https://lists.yoctoproject.org/listinfo/meta-freescale).
Differences are described on below link
http://freescale.github.io/doc/release-notes/1.8/
Seems uboot from Community BSPs releases supports USB in U-Boot. You could post your question on Yocto mailing list for more details.
You could also refer to the following threads, which discus similar issues:
https://community.freescale.com/thread/376236
https://community.freescale.com/thread/311585
Hope this will be useful for you.
Best regards!
/Carlos
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