net/fm: fixup ethernet for mEMAC

- set proper compatible property name for mEMAC.
- fixed ft_fixup_port for dual-role mEMAC, which will lead to
  MAC node disabled incorrectly.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/drivers/net/fm/fm.h b/drivers/net/fm/fm.h
index 228df33..ba581e9 100644
--- a/drivers/net/fm/fm.h
+++ b/drivers/net/fm/fm.h
@@ -152,4 +152,6 @@
 #define MAX_RXBUF_LOG2		11
 #define MAX_RXBUF_LEN		(1 << MAX_RXBUF_LOG2)
 
+#define PORT_IS_ENABLED(port)	fm_info[fm_port_to_index(port)].enabled
+
 #endif /* __FM_H__ */