arm: Move FSL_LSCH2 FSL_LSCH3 to Kconfig

Move these options to Kconfig and create a sub-menu to avoid name
conflict with other architectures.

Signed-off-by: York Sun <york.sun@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ddc7d7b..5f185e1 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -652,6 +652,7 @@
 
 config TARGET_LS2080A_EMU
 	bool "Support ls2080a_emu"
+	select ARCH_LS2080A
 	select ARM64
 	select ARMV8_MULTIENTRY
 	help
@@ -662,6 +663,7 @@
 
 config TARGET_LS2080A_SIMU
 	bool "Support ls2080a_simu"
+	select ARCH_LS2080A
 	select ARM64
 	select ARMV8_MULTIENTRY
 	help
@@ -672,6 +674,7 @@
 
 config TARGET_LS2080AQDS
 	bool "Support ls2080aqds"
+	select ARCH_LS2080A
 	select ARM64
 	select ARMV8_MULTIENTRY
 	select SUPPORT_SPL
@@ -683,6 +686,7 @@
 
 config TARGET_LS2080ARDB
 	bool "Support ls2080ardb"
+	select ARCH_LS2080A
 	select ARM64
 	select ARMV8_MULTIENTRY
 	select SUPPORT_SPL