usb: musb: clear AUTOSET while clearing DMAENAB

On the completion of tx dma, dma is disabled by clearing MUSB_TXCSR_DMAENAB in
TXCSR. If MUSB_TXCSR_AUTOSET was set in txstate() it will remain set although
it is not needed in PIO mode. Clear it as soon as it is not needed.
Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/musb/musb_gadget.c

@@ -535,7 +535,7 @@ void musb_g_tx(struct musb *musb, u8 epnum)
 			is_dma = 1;
 			csr |= MUSB_TXCSR_P_WZC_BITS;
 			csr &= ~(MUSB_TXCSR_DMAENAB | MUSB_TXCSR_P_UNDERRUN |
-				 MUSB_TXCSR_TXPKTRDY);
+				 MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_AUTOSET);
 			musb_writew(epio, MUSB_TXCSR, csr);
 			/* Ensure writebuffer is empty. */
 			csr = musb_readw(epio, MUSB_TXCSR);