hw/arm/Kconfig: no need to enable ACPI_MEMORY_HOTPLUG/ACPI_NVDIMM explicitly

hw/arm/Kconfig: no need to enable ACPI_MEMORY_HOTPLUG/ACPI_NVDIMM explicitly

Since commit
36b79e3219d ("hw/acpi/Kconfig: Add missing Kconfig dependencies (build error)"),
ACPI_MEMORY_HOTPLUG and ACPI_NVDIMM is implicitly turned on when
ACPI_HW_REDUCED is selected. ACPI_HW_REDUCED is already enabled. No need to
turn on ACPI_MEMORY_HOTPLUG or ACPI_NVDIMM explicitly. This is a minor cleanup.

Signed-off-by: Ani Sinha <ani@anisinha.ca>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20210819162637.518507-1-ani@anisinha.ca
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>