usb: musb: replace ifndef with ifdef for CONFIG_MUSB_PIO_ONLY

The ifdef reads somehow better than an ifndef

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/musb/musb_dma.h b/drivers/usb/musb/musb_dma.h
index 1b6b827..8919ce2 100644
--- a/drivers/usb/musb/musb_dma.h
+++ b/drivers/usb/musb/musb_dma.h
@@ -62,10 +62,10 @@
 
 #define	DMA_ADDR_INVALID	(~(dma_addr_t)0)
 
-#ifndef CONFIG_MUSB_PIO_ONLY
-#define	is_dma_capable()	(1)
-#else
+#ifdef CONFIG_MUSB_PIO_ONLY
 #define	is_dma_capable()	(0)
+#else
+#define	is_dma_capable()	(1)
 #endif
 
 #ifdef CONFIG_USB_TI_CPPI_DMA