net: Move some header files to include/

The fsl_dtsec.h & fsl_tgec.h & fsl_fman.h can be shared on both ARM
and PPC, move it out of ppc to include/, and change the path in
drivers accordingly.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Gong Qianyu <Qianyu.Gong@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/board/freescale/p2041rdb/eth.c b/board/freescale/p2041rdb/eth.c
index 532eeac..95fe85b 100644
--- a/board/freescale/p2041rdb/eth.c
+++ b/board/freescale/p2041rdb/eth.c
@@ -19,7 +19,7 @@
 #include <fm_eth.h>
 #include <fsl_mdio.h>
 #include <malloc.h>
-#include <asm/fsl_dtsec.h>
+#include <fsl_dtsec.h>
 
 #include "cpld.h"
 #include "../common/fman.h"