Make tusb use musb_set_vbus() to turn on VBUS.
This should probably be handled in core musb code eventually.
Signed-off-by: Tony Lindgren <tony@atomide.com>
                        switch (musb->xceiv.state) {
                        case OTG_STATE_A_IDLE:
                                DBG(2, "Got SRP, turning on VBUS\n");
-                               devctl = musb_readb(musb->mregs,
-                                                       MUSB_DEVCTL);
-                               devctl |= MUSB_DEVCTL_SESSION;
-                               musb_writeb(musb->mregs, MUSB_DEVCTL,
-                                                       devctl);
-                               musb->xceiv.state = OTG_STATE_A_WAIT_VRISE;
+                               musb_set_vbus(musb, 1);
 
                                /* CONNECT can wake if a_wait_bcon is set */
                                if (musb->a_wait_bcon != 0)