usb: musb: tusb6010: Add tusb_revision to struct musb to store the revision.

Add field to store tusb6010 revision value. Read the revision at
the startup and store to the variable.
Signed-off-by: NMatwey V. Kornilov <matwey@sai.msu.ru>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/musb/musb_core.h

@@ -339,6 +339,7 @@ struct musb {
 	dma_addr_t		async;
 	dma_addr_t		sync;
 	void __iomem		*sync_va;
+	u8			tusb_revision;
 #endif
 
 	/* passed down from chip/board specific irq handlers */

drivers/usb/musb/tusb6010.c

@@ -1012,6 +1012,7 @@ static int tusb_musb_start(struct musb *musb)
 		goto err;
 	}
 
+	musb->tusb_revision = tusb_get_revision(musb);
 	ret = tusb_print_revision(musb);
 	if (ret < 2) {
 		printk(KERN_ERR "tusb: Unsupported TUSB6010 revision %i\n",