Convert CONFIG_ARCH_MAP_SYSMEM to Kconfig

This converts the following to Kconfig:
   CONFIG_ARCH_MAP_SYSMEM

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index ba2c57d..ee32e83 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1,3 +1,7 @@
+config ARCH_MAP_SYSMEM
+	depends on SANDBOX || NDS32
+	def_bool y
+
 config CREATE_ARCH_SYMLINK
 	bool
 
diff --git a/arch/sandbox/Kconfig b/arch/sandbox/Kconfig
index 7cdbaef..477c519 100644
--- a/arch/sandbox/Kconfig
+++ b/arch/sandbox/Kconfig
@@ -1,9 +1,6 @@
 menu "Sandbox architecture"
 	depends on SANDBOX
 
-config ARCH_MAP_SYSMEM
-	def_bool y
-
 config SYS_ARCH
 	default "sandbox"
 
diff --git a/include/configs/adp-ae3xx.h b/include/configs/adp-ae3xx.h
index 973033d..d583733 100644
--- a/include/configs/adp-ae3xx.h
+++ b/include/configs/adp-ae3xx.h
@@ -17,8 +17,6 @@
 
 #define CONFIG_SKIP_TRUNOFF_WATCHDOG
 
-#define CONFIG_ARCH_MAP_SYSMEM
-
 #define CONFIG_BOOTP_SERVERIP
 
 #ifdef CONFIG_SKIP_LOWLEVEL_INIT
diff --git a/include/configs/adp-ag101p.h b/include/configs/adp-ag101p.h
index f533ada..f2c0a00 100644
--- a/include/configs/adp-ag101p.h
+++ b/include/configs/adp-ag101p.h
@@ -15,8 +15,6 @@
  */
 #define CONFIG_USE_INTERRUPT
 
-#define CONFIG_ARCH_MAP_SYSMEM
-
 #define CONFIG_BOOTP_SERVERIP
 
 #ifndef CONFIG_SKIP_LOWLEVEL_INIT