radeonfb: add chip definition for RV370 5b63

... which I've found on a Sapphire X550 (Silent).
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andreas Herrmann <aherrman@arcor.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/aty/radeon_base.c

@@ -202,6 +202,7 @@ static struct pci_device_id radeonfb_pci_table[] = {
 	CHIP_DEF(PCI_CHIP_RV380_3154,	RV380,	CHIP_HAS_CRTC2 | CHIP_IS_MOBILITY),
 	CHIP_DEF(PCI_CHIP_RV370_5B60,	RV380,	CHIP_HAS_CRTC2),
 	CHIP_DEF(PCI_CHIP_RV370_5B62,	RV380,	CHIP_HAS_CRTC2),
+	CHIP_DEF(PCI_CHIP_RV370_5B63,	RV380,	CHIP_HAS_CRTC2),
 	CHIP_DEF(PCI_CHIP_RV370_5B64,	RV380,	CHIP_HAS_CRTC2),
 	CHIP_DEF(PCI_CHIP_RV370_5B65,	RV380,	CHIP_HAS_CRTC2),
 	CHIP_DEF(PCI_CHIP_RV370_5460,	RV380,	CHIP_HAS_CRTC2 | CHIP_IS_MOBILITY),