[PATCH] xen/arm64: Default ACPI support enabled

[Elliott Mitchell <ehem+xen@m5p.com>]

Unlike other unsupportted options, ACPI support is required to *boot*
for a number of platforms.  Users on these platforms are unable to use
distribution builds and must rebuild from source to use Xen.

Signed-off-by: Elliott Mitchell <ehem+xen@m5p.com>
---
Stripping this down to near-minimum.  Previous similar commits had
included a message in dmesg, but the community call indicated doing near
the absolute minimum.

There was also a mention of potentially marking Xen as tainted in this
case.  That seems reasonable to me.  Just ACPI support needs to default
enabled now.
---
 xen/arch/arm/Kconfig | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index 239d3aed3c..778bee5792 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -29,13 +29,18 @@ menu "Architecture Features"
 source "arch/Kconfig"
 
 config ACPI
-	bool "ACPI (Advanced Configuration and Power Interface) Support (UNSUPPORTED)" if UNSUPPORTED
+	bool "ACPI (Advanced Configuration and Power Interface) Support (UNSUPPORTED)"
 	depends on ARM_64
+	default y
 	---help---
 
 	  Advanced Configuration and Power Interface (ACPI) support for Xen is
 	  an alternative to device tree on ARM64.
 
+	  Note this is presently UNSUPPORTED.  If a given device has both
+	  device-tree and ACPI support, it is presently (February 2023)
+	  recommended to boot using the device-tree.
+
 config ARM_EFI
 	bool
 
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