nds32: Remove the architecture

As removal of nds32 has been ack'd for the Linux kernel, remove support
here as well.

Cc: Rick Chen <rick@andestech.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Rick Chen <rick@andestech.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index c3e9f9a..12de8a1 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1,5 +1,5 @@
 config ARCH_MAP_SYSMEM
-	depends on SANDBOX || NDS32
+	depends on SANDBOX
 	def_bool y
 
 config CREATE_ARCH_SYMLINK
@@ -87,10 +87,6 @@
 	select SUPPORT_OF_CONTROL
 	select SPL_SEPARATE_BSS if SPL
 
-config NDS32
-	bool "NDS32 architecture"
-	select SUPPORT_OF_CONTROL
-
 config NIOS2
 	bool "Nios II architecture"
 	select CPU
@@ -382,7 +378,7 @@
 
 config SKIP_LOWLEVEL_INIT
 	bool "Skip the calls to certain low level initialization functions"
-	depends on ARM || NDS32 || MIPS || RISCV
+	depends on ARM || MIPS || RISCV
 	help
 	  If enabled, then certain low level initializations (like setting up
 	  the memory controller) are omitted and/or U-Boot does not relocate
@@ -393,7 +389,7 @@
 
 config SPL_SKIP_LOWLEVEL_INIT
 	bool "Skip the calls to certain low level initialization functions"
-	depends on SPL && (ARM || NDS32 || MIPS || RISCV)
+	depends on SPL && (ARM || MIPS || RISCV)
 	help
 	  If enabled, then certain low level initializations (like setting up
 	  the memory controller) are omitted and/or U-Boot does not relocate
@@ -442,7 +438,6 @@
 source "arch/m68k/Kconfig"
 source "arch/microblaze/Kconfig"
 source "arch/mips/Kconfig"
-source "arch/nds32/Kconfig"
 source "arch/nios2/Kconfig"
 source "arch/powerpc/Kconfig"
 source "arch/sandbox/Kconfig"