powerpc: P4080: Remove macro CONFIG_PPC_P4080

Replace CONFIG_PPC_P4080 with ARCH_P4080 in Kconfig and clean up
existing macros.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/powerpc/include/asm/fsl_secure_boot.h b/arch/powerpc/include/asm/fsl_secure_boot.h
index b75ae11..38b666c 100644
--- a/arch/powerpc/include/asm/fsl_secure_boot.h
+++ b/arch/powerpc/include/asm/fsl_secure_boot.h
@@ -59,7 +59,7 @@
 #endif
 
 #if defined(CONFIG_ARCH_P3041)	||	\
-	defined(CONFIG_PPC_P4080) ||	\
+	defined(CONFIG_ARCH_P4080) ||	\
 	defined(CONFIG_PPC_P5020) ||	\
 	defined(CONFIG_PPC_P5040) ||	\
 	defined(CONFIG_ARCH_P2041)