x86: Allow any arch to generate ACPI tables

These have sadly found their way to ARM now. Allow any arch to support
generating ACPI tables.

Disable this for the tools build.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/Kconfig b/arch/Kconfig
index 343db9e..b5aa83d 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -152,6 +152,7 @@
 	select SYS_CACHE_SHIFT_4
 	select IRQ
 	select SUPPORT_EXTENSION_SCAN
+	select SUPPORT_ACPI
 	imply BITREVERSE
 	select BLOBLIST
 	imply LTO
@@ -217,6 +218,7 @@
 	select HAVE_PRIVATE_LIBGCC
 	select OF_CONTROL
 	select PCI
+	select SUPPORT_ACPI
 	select SUPPORT_OF_CONTROL
 	select SYS_CACHE_SHIFT_6
 	select TIMER