powerpc: P1010: Remove macro CONFIG_P1010

Replace CONFIG_P1010 with ARCH_P1010 in Kconfig and clean up existing
macros.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index 7d81dfc..adad3d3 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -140,7 +140,7 @@
 #define CONFIG_SYS_FSL_ERRATUM_A004508
 #define CONFIG_SYS_FSL_ERRATUM_A005125
 
-#elif defined(CONFIG_P1010)
+#elif defined(CONFIG_ARCH_P1010)
 #define CONFIG_MAX_CPUS			1
 #define CONFIG_FSL_SDHC_V2_3
 #define CONFIG_SYS_FSL_NUM_LAWS		12