armv8: ls1046a: Convert CONFIG_LS1046A to Kconfig option ARCH_LS1046A

Move this option to Kconfig and clean up existing uses.

Signed-off-by: York Sun <york.sun@nxp.com>
CC: Mingkai Hu <mingkai.hu@nxp.com>
CC: Gong Qianyu <Qianyu.Gong@nxp.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 1560bcc..aed89c9 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -843,6 +843,7 @@
 
 config TARGET_LS1046AQDS
 	bool "Support ls1046aqds"
+	select ARCH_LS1046A
 	select ARM64
 	select ARMV8_MULTIENTRY
 	select SUPPORT_SPL
@@ -855,6 +856,7 @@
 
 config TARGET_LS1046ARDB
 	bool "Support ls1046ardb"
+	select ARCH_LS1046A
 	select ARM64
 	select ARMV8_MULTIENTRY
 	select SUPPORT_SPL
@@ -951,6 +953,8 @@
 
 source "arch/arm/cpu/armv7/omap-common/Kconfig"
 
+source "arch/arm/cpu/armv8/fsl-layerscape/Kconfig"
+
 source "arch/arm/mach-orion5x/Kconfig"
 
 source "arch/arm/mach-rmobile/Kconfig"