ppc4xx: Consolidate PPC4xx UIC defines

This patch is the first step to consolidate the UIC related defines in the
4xx headers. Move header from asm-ppc/ppc4xx-intvec.h to
asm-ppc/ppc4xx-uic.h as it will hold all UIC related defines in the next
steps.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/cpu/ppc4xx/usbdev.c b/cpu/ppc4xx/usbdev.c
index d71ba77..27e6a40 100644
--- a/cpu/ppc4xx/usbdev.c
+++ b/cpu/ppc4xx/usbdev.c
@@ -6,8 +6,8 @@
 #if (defined(CONFIG_440EP) || defined(CONFIG_440EPX)) && defined(CONFIG_CMD_USB)
 
 #include <usb.h>
+#include <asm/ppc4xx-uic.h>
 #include "usbdev.h"
-#include <asm/ppc4xx-intvec.h>
 
 #define USB_DT_DEVICE        0x01
 #define USB_DT_CONFIG        0x02