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/drivers/net/fm/fm.h b/drivers/net/fm/fm.h
index 73c525e..fa9bc9f 100644
--- a/drivers/net/fm/fm.h
+++ b/drivers/net/fm/fm.h
@@ -10,7 +10,7 @@
 #include <common.h>
 #include <phy.h>
 #include <fm_eth.h>
-#include <asm/fsl_fman.h>
+#include <fsl_fman.h>
 
 /* Port ID */
 #define OH_PORT_ID_BASE		0x01