net: airoha: Fix MBI_RX_AGE_SEL_MASK definition

Fix copy-paste error in MBI_RX_AGE_SEL_MASK macro definition

Fixes: 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/d27d0465be1bff3369e886e5f10c4d37fefc4934.1721419930.git.lorenzo@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: LorenzoBianconi

drivers/net/ethernet/mediatek/airoha_eth.c

@@ -249,7 +249,7 @@
 #define REG_FE_GDM_RX_ETH_L1023_CNT_H(_n)	(GDM_BASE(_n) + 0x2fc)
 
 #define REG_GDM2_CHN_RLS		(GDM2_BASE + 0x20)
-#define MBI_RX_AGE_SEL_MASK		GENMASK(18, 17)
+#define MBI_RX_AGE_SEL_MASK		GENMASK(26, 25)
 #define MBI_TX_AGE_SEL_MASK		GENMASK(18, 17)
 
 #define REG_GDM3_FWD_CFG		GDM3_BASE