ARM: dts: am335x-evm: Enable the McASP FIFO for audio

The use of FIFO in McASP can reduce the risk of audio under/overrun and
lowers the load on the memories since the DMA will operate in bursts.
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-evm.dts

@@ -529,8 +529,8 @@
 		serial-dir = <  /* 0: INACTIVE, 1: TX, 2: RX */
 			0 0 1 2
 		>;
-		tx-num-evt = <1>;
-		rx-num-evt = <1>;
+		tx-num-evt = <32>;
+		rx-num-evt = <32>;
 };
 
 &tps {