powerpc: T1024: Remove macro CONFIG_PPC_T1024

Replace CONFIG_PPC_T1024 with ARCH_T1024 in Kconfig and clean up
existing macros.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/powerpc/cpu/mpc85xx/Makefile b/arch/powerpc/cpu/mpc85xx/Makefile
index 8988af1..574259c 100644
--- a/arch/powerpc/cpu/mpc85xx/Makefile
+++ b/arch/powerpc/cpu/mpc85xx/Makefile
@@ -54,7 +54,7 @@
 obj-$(CONFIG_PPC_T1020)	+= t1040_ids.o
 obj-$(CONFIG_PPC_T1022)	+= t1040_ids.o
 obj-$(CONFIG_ARCH_T1023) += t1024_ids.o
-obj-$(CONFIG_PPC_T1024) += t1024_ids.o
+obj-$(CONFIG_ARCH_T1024) += t1024_ids.o
 obj-$(CONFIG_PPC_T2080) += t2080_ids.o
 obj-$(CONFIG_PPC_T2081) += t2080_ids.o
 
@@ -97,7 +97,7 @@
 obj-$(CONFIG_PPC_T1020)	+= t1040_serdes.o
 obj-$(CONFIG_PPC_T1022)	+= t1040_serdes.o
 obj-$(CONFIG_ARCH_T1023) += t1024_serdes.o
-obj-$(CONFIG_PPC_T1024) += t1024_serdes.o
+obj-$(CONFIG_ARCH_T1024) += t1024_serdes.o
 obj-$(CONFIG_PPC_T2080) += t2080_serdes.o
 obj-$(CONFIG_PPC_T2081) += t2080_serdes.o