[PATCH for-next/vcpu-hotplug] arm64: Kconfig: Fix dependencies to enable ACPI_HOTPLUG_CPU

[Gavin Shan <gshan@redhat.com>]

Both ACPI_PROCESSOR and HOTPLUG_CPU are needed by ACPI_HOTPLUG_CPU.
Otherwise, we can have compiling error with the following configurations.

  CONFIG_HOTPLUG_CPU=n
  CONFIG_ACPI_PROCESSOR=y
  CONFIG_ACPI_HOTPLUG_CPU=y

  arch/arm64/kernel/smp.c: In function ‘arch_unregister_cpu’:
  arch/arm64/kernel/smp.c:563:9: error: implicit declaration of  \
  function ‘unregister_cpu’; did you mean ‘register_cpu’?        \
  [-Werror=implicit-function-declaration]
  563 |         unregister_cpu(c);
      |         ^~~~~~~~~~~~~~
      |         register_cpu

Fix it by enabling ACPI_HOTPLUG_CPU when both ACPI_PROCESSOR and
HOTPLUG_CPU are enabled, consistent with other architectures like
x86 and loongarch.

Fixes: 9d0873892f4d ("arm64: Kconfig: Enable hotplug CPU on arm64 if ACPI_PROCESSOR is enabled.")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202406300437.XnuW0n34-lkp@intel.com/
Signed-off-by: Gavin Shan <gshan@redhat.com>
---
 arch/arm64/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e8f2ef2312db..ff17c5705324 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -5,7 +5,7 @@ config ARM64
 	select ACPI_CCA_REQUIRED if ACPI
 	select ACPI_GENERIC_GSI if ACPI
 	select ACPI_GTDT if ACPI
-	select ACPI_HOTPLUG_CPU if ACPI_PROCESSOR
+	select ACPI_HOTPLUG_CPU if ACPI_PROCESSOR && HOTPLUG_CPU
 	select ACPI_IORT if ACPI
 	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
 	select ACPI_MCFG if (ACPI && PCI)
-- 
2.45.1