powerpc: T1023: Remove macro CONFIG_PPC_T1023

Replace CONFIG_PPC_T1023 with ARCH_T1023 in Kconfig and clean up
existing macros.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/drivers/net/fm/Makefile b/drivers/net/fm/Makefile
index 73bd31d..7526d2f 100644
--- a/drivers/net/fm/Makefile
+++ b/drivers/net/fm/Makefile
@@ -28,7 +28,7 @@
 obj-$(CONFIG_PPC_T1042)	+= t1040.o
 obj-$(CONFIG_PPC_T1020)	+= t1040.o
 obj-$(CONFIG_PPC_T1022)	+= t1040.o
-obj-$(CONFIG_PPC_T1023) += t1024.o
+obj-$(CONFIG_ARCH_T1023) += t1024.o
 obj-$(CONFIG_PPC_T1024) += t1024.o
 obj-$(CONFIG_PPC_T2080) += t2080.o
 obj-$(CONFIG_PPC_T2081) += t2080.o