x86: Move setjmp to the i386 directory

This code is only used in 32-bit mode. Move it so that it does not get
built with 64-bit U-Boot.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/cpu/Makefile

@@ -14,9 +14,6 @@ else
 extra-y	= start.o
 endif
 extra-$(CONFIG_$(SPL_)X86_16BIT_INIT) += resetvec.o start16.o
-ifndef CONFIG_$(SPL_)X86_64
-obj-y	+= setjmp.o
-endif
 
 obj-y	+= cpu.o cpu_x86.o
 

arch/x86/cpu/i386/Makefile

@@ -6,3 +6,4 @@
 obj-y += call64.o
 obj-y += cpu.o
 obj-y += interrupt.o
+obj-y += setjmp.o