powerpc: T1040: Remove macro CONFIG_PPC_T1040

Replace CONFIG_PPC_T1040 with ARCH_T1040 in Kconfig and clean up
existing macros.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/t102xqds/spl.c b/board/freescale/t102xqds/spl.c
index 61bfb29..c9239b8 100644
--- a/board/freescale/t102xqds/spl.c
+++ b/board/freescale/t102xqds/spl.c
@@ -66,7 +66,7 @@
 	u32 plat_ratio, sys_clk, ccb_clk;
 	ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
 
-#if defined(CONFIG_PPC_T1040) && defined(CONFIG_SPL_NAND_BOOT)
+#if defined(CONFIG_ARCH_T1040) && defined(CONFIG_SPL_NAND_BOOT)
 	/*
 	 * There is T1040 SoC issue where NOR, FPGA are inaccessible during
 	 * NAND boot because IFC signals > IFC_AD7 are not enabled.