net: airoha: Fix EGRESS_RATE_METER_EN_MASK definition

Fix typo in EGRESS_RATE_METER_EN_MASK mask definition. This bus in not
introducing any user visible problem since, even if we are setting
EGRESS_RATE_METER_EN_MASK bit in REG_EGRESS_RATE_METER_CFG register,
egress QoS metering is not supported yet since we are missing some other
hw configurations (e.g token bucket rate, token bucket size).

Introduced by commit 23020f0 ("net: airoha: Introduce ethernet support
for EN7581 SoC")

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241009-airoha-fixes-v2-1-18af63ec19bf@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mediatek/airoha_eth.c

@@ -554,7 +554,7 @@
 #define FWD_DSCP_LOW_THR_MASK		GENMASK(17, 0)
 
 #define REG_EGRESS_RATE_METER_CFG		0x100c
-#define EGRESS_RATE_METER_EN_MASK		BIT(29)
+#define EGRESS_RATE_METER_EN_MASK		BIT(31)
 #define EGRESS_RATE_METER_EQ_RATE_EN_MASK	BIT(17)
 #define EGRESS_RATE_METER_WINDOW_SZ_MASK	GENMASK(16, 12)
 #define EGRESS_RATE_METER_TIMESLICE_MASK	GENMASK(10, 0)