FEC: Replace magic contants

Replace the magic contant 1 << 24 with properly defined bits.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/net/fec_mxc.h b/drivers/net/fec_mxc.h
index 852b2e0..203285a 100644
--- a/drivers/net/fec_mxc.h
+++ b/drivers/net/fec_mxc.h
@@ -213,6 +213,9 @@
 
 #define FEC_X_WMRK_STRFWD		0x00000100
 
+#define FEC_X_DES_ACTIVE_TDAR		0x01000000
+#define FEC_R_DES_ACTIVE_RDAR		0x01000000
+
 #if defined(CONFIG_MX25) || defined(CONFIG_MX53)
 /* defines for MIIGSK */
 /* RMII frequency control: 0=50MHz, 1=5MHz */