net: mvneta: replace magic numbers by existing macros

Some literal values are actually already defined by macros, so let's use
them.

[gregory.clement@free-electrons.com: split intial commit in two
individual changes]
Signed-off-by: Dmitri Epshtein <dima@marvell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvneta.c

@@ -1114,7 +1114,7 @@ static void mvneta_port_down(struct mvneta_port *pp)
 		mdelay(1);
 
 		val = mvreg_read(pp, MVNETA_RXQ_CMD);
-	} while (val & 0xff);
+	} while (val & MVNETA_RXQ_ENABLE_MASK);
 
 	/* Stop Tx port activity. Check port Tx activity. Issue stop
 	 * command for active channels only
@@ -1139,7 +1139,7 @@ static void mvneta_port_down(struct mvneta_port *pp)
 		/* Check TX Command reg that all Txqs are stopped */
 		val = mvreg_read(pp, MVNETA_TXQ_CMD);
 
-	} while (val & 0xff);
+	} while (val & MVNETA_TXQ_ENABLE_MASK);
 
 	/* Double check to verify that TX FIFO is empty */
 	count = 0;