sh/ap_sh4a_4a: Fix typo of operator in ET0_ETXD4

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

board/alphaproject/ap_sh4a_4a/ap_sh4a_4a.c

@@ -51,7 +51,7 @@ int checkboard(void)
 #define ET0_ETXD1_A (0x4 << 9)
 #define ET0_ETXD2_A (0x4 << 12)
 #define ET0_ETXD3_A (0x4 << 15)
-#define ET0_ETXD4 (0x3 < 18)
+#define ET0_ETXD4 (0x3 << 18)
 #define ET0_ETXD5_A (0x5 << 21)
 #define ET0_ETXD6_A (0x5 << 24)
 #define ET0_ETXD7 (0x4 << 27)