sunxi: usb: Rename the usbc.? files to usb_phy.?

The usbc.? files now only contain usb-phy related code, rename them to make
this clear.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/drivers/usb/host/ehci-sunxi.c b/drivers/usb/host/ehci-sunxi.c
index b6fa538..9e74a0b 100644
--- a/drivers/usb/host/ehci-sunxi.c
+++ b/drivers/usb/host/ehci-sunxi.c
@@ -12,7 +12,7 @@
 
 #include <common.h>
 #include <asm/arch/clock.h>
-#include <asm/arch/usbc.h>
+#include <asm/arch/usb_phy.h>
 #include <asm/io.h>
 #include "ehci.h"