x86: Move commands from under arch/x86 to cmd/x86/

We only need to compile and link these files when building for full
U-Boot.  Move them to under cmd/x86/ to make sure they aren't linked in
and undiscarded due to u_boot_list_2_cmd_* being included).

Cc: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/cmd/Makefile b/cmd/Makefile
index 00e3869..ab45bf4 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -150,6 +150,8 @@
 obj-$(CONFIG_CMD_REGULATOR) += regulator.o
 
 obj-$(CONFIG_CMD_BLOB) += blob.o
+
+obj-$(CONFIG_X86) += x86/
 endif # !CONFIG_SPL_BUILD
 
 # core command