powerpc: T4080: Drop configuration for T4080

There is no T4080 target. Drop related macros.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/powerpc/cpu/mpc85xx/t4240_serdes.c b/arch/powerpc/cpu/mpc85xx/t4240_serdes.c
index 1a5bcb1..3fc527d 100644
--- a/arch/powerpc/cpu/mpc85xx/t4240_serdes.c
+++ b/arch/powerpc/cpu/mpc85xx/t4240_serdes.c
@@ -263,7 +263,7 @@
 	{18, {PCIE3, PCIE3, PCIE3, PCIE3, AURORA, AURORA, AURORA, AURORA}},
 	{}
 };
-#elif defined(CONFIG_ARCH_T4160) || defined(CONFIG_PPC_T4080)
+#elif defined(CONFIG_ARCH_T4160)
 static const struct serdes_config serdes1_cfg_tbl[] = {
 	/* SerDes 1 */
 	{1, {NONE, NONE, NONE, NONE,