x86: config option for loading ACPI table from QEMU

This patch adds a config option for loading ACPI table from QEMU. When enabled,
U-Boot won't generate ACPI tables, but use those provided by QEMU.

Signed-off-by: Miao Yan <yanmiaobest@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/Kconfig

@@ -358,6 +358,15 @@ config GENERATE_ACPI_TABLE
 	  by the operating system. It defines platform-independent interfaces
 	  for configuration and power management monitoring.
 
+config QEMU_ACPI_TABLE
+	bool "Load ACPI table from QEMU fw_cfg interface"
+	depends on GENERATE_ACPI_TABLE && QEMU
+	default y
+	help
+	  By default, U-Boot generates its own ACPI tables. This option, if
+	  enabled, disables U-Boot's version and loads ACPI tables generated
+	  by QEMU.
+
 config GENERATE_SMBIOS_TABLE
 	bool "Generate an SMBIOS (System Management BIOS) table"
 	default y