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/T102xQDS.h b/include/configs/T102xQDS.h
index c290101..3c0a0c9 100644
--- a/include/configs/T102xQDS.h
+++ b/include/configs/T102xQDS.h
@@ -497,7 +497,7 @@
 #define CONFIG_SYS_NS16550_COM4	(CONFIG_SYS_CCSRBAR+0x11D600)
 
 /* Video */
-#ifdef CONFIG_PPC_T1024		/* no DIU on T1023 */
+#ifdef CONFIG_ARCH_T1024		/* no DIU on T1023 */
 #define CONFIG_FSL_DIU_FB
 #ifdef CONFIG_FSL_DIU_FB
 #define CONFIG_FSL_DIU_CH7301