Replace "#include <asm-$ARCH/$FILE>" with "#include <asm/$FILE>"

The appropriate include/asm-$ARCH directory should already by symlinked
to include/asm so using the whole "asm-$ARCH" path is unnecessary.

This change should also allow us to move the include/asm-$ARCH
directories into their appropriate lib/$ARCH/ directories.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/sandburst/common/ppc440gx_i2c.c b/board/sandburst/common/ppc440gx_i2c.c
index 35c4e60..dbc0cee 100644
--- a/board/sandburst/common/ppc440gx_i2c.c
+++ b/board/sandburst/common/ppc440gx_i2c.c
@@ -31,7 +31,7 @@
 #include <i2c.h>
 #include <command.h>
 #include "ppc440gx_i2c.h"
-#include <asm-ppc/io.h>
+#include <asm/io.h>
 
 #ifdef CONFIG_I2C_BUS1