usb: renesas_usbhs: fix usbhs_pipe_malloc() to re-enable a pipe.

This patch fixes an issue that the driver cannot push a new data when
a pipe is re-enabled after the pipe is queued.

Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>