This reverts commit cd14247d.

R-Car D3 can use OTG mode in fact. So, the commit doesn't need anymore.
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>