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/board/amcc/sequoia/sequoia.c b/board/amcc/sequoia/sequoia.c
index b833092..87f5d5d 100644
--- a/board/amcc/sequoia/sequoia.c
+++ b/board/amcc/sequoia/sequoia.c
@@ -25,12 +25,11 @@
 #include <common.h>
 #include <libfdt.h>
 #include <fdt_support.h>
-#include <ppc440.h>
+#include <ppc4xx.h>
 #include <asm/gpio.h>
 #include <asm/processor.h>
 #include <asm/io.h>
 #include <asm/bitops.h>
-#include <asm/ppc4xx-intvec.h>
 
 DECLARE_GLOBAL_DATA_PTR;