hw/acpi/Kconfig: Create acpi Kconfig

Add the new file to hw/Kconfig.

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>
hw/ide/Kconfig: Select IDE_PIIX for IDE_VIA

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>
hw/mips/Kconfig: Add MIPS Kconfig

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>