x86: qemu: Move qfw command over to cmd and add Kconfig entry

- Move the command portion of arch/x86/cpu/qemu/fw_cfg.c into
  cmd/qemu_fw_cfg.c
- Move arch/x86/include/asm/fw_cfg.h to include/qemu_fw_cfg.h
- Rename ACPI table portion to arch/x86/cpu/qemu/acpi_table.c

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 9336752..c0fffe3 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -593,6 +593,13 @@
 	     sound init   - set up sound system
 	     sound play   - play a sound
 
+config CMD_QEMU_FW_CFG
+	bool "qfw"
+	depends on X86
+	help
+	  This provides access to the QEMU firmware interface.  The main
+	  feature is to allow easy loading of files passed to qemu-system
+	  via -kernel / -initrd
 endmenu
 
 config CMD_BOOTSTAGE