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/include/configs/T102xRDB.h b/include/configs/T102xRDB.h
index 5b233bc..aa65eb4 100644
--- a/include/configs/T102xRDB.h
+++ b/include/configs/T102xRDB.h
@@ -34,7 +34,7 @@
 #define CONFIG_FSL_CAAM			/* Enable SEC/CAAM */
 
 /* support deep sleep */
-#ifdef CONFIG_PPC_T1024
+#ifdef CONFIG_ARCH_T1024
 #define CONFIG_DEEP_SLEEP
 #endif
 #if defined(CONFIG_DEEP_SLEEP)
@@ -858,7 +858,7 @@
 #define CONFIG_BAUDRATE		115200
 #define __USB_PHY_TYPE		utmi
 
-#ifdef CONFIG_PPC_T1024
+#ifdef CONFIG_ARCH_T1024
 #define CONFIG_BOARDNAME t1024rdb
 #define BANK_INTLV cs0_cs1
 #else