arm: Move SYS_FSL_SRDS_* and SYS_HAS_SERDES to Kconfig

Move these options to Kconfig and clean up existing uses.

Signed-off-by: York Sun <york.sun@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
index 7aae397..28589ae 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
+++ b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
@@ -14,16 +14,23 @@
 	bool
 	select FSL_LSCH2
 	select SYS_FSL_ERRATUM_A010539
+	select SYS_FSL_SRDS_2
 
 config ARCH_LS2080A
 	bool
 	select FSL_LSCH3
+	select SYS_FSL_HAS_DP_DDR
+	select SYS_FSL_SRDS_2
 
 config FSL_LSCH2
 	bool
+	select SYS_FSL_SRDS_1
+	select SYS_HAS_SERDES
 
 config FSL_LSCH3
 	bool
+	select SYS_FSL_SRDS_1
+	select SYS_HAS_SERDES
 
 menu "Layerscape architecture"
 	depends on FSL_LSCH2 || FSL_LSCH3
@@ -65,4 +72,13 @@
 config SYS_FSL_HAS_DP_DDR
 	bool
 
+config SYS_FSL_SRDS_1
+	bool
+
+config SYS_FSL_SRDS_2
+	bool
+
+config SYS_HAS_SERDES
+	bool
+
 endmenu