config: ls1012aqds: Enable USB EHCI support for ls1012aqds

Signed-off-by: Rajat Srivastava <rajat.srivastava@nxp.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat@nxp.com>
Signed-off-by: yinbo.zhu <yinbo.zhu@nxp.com>
[YS: Revise subject, remove commit message]
Reviewed-by: York Sun <york.sun@nxp.com>