hw/isa: fix ISA_SUPERIO dependencies

ISA_SUPERIO does not provide an ISA bus, so it should not select the symbol:
instead it requires one.  Among its users, VT82C686 is the only one that
is a PCI-ISA bridge and does not already select ISA_BUS.

Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Bernhard Beschow <shentey@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20240213155005.109954-5-pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

hw/isa/Kconfig

@@ -15,7 +15,7 @@ config I82378
 
 config ISA_SUPERIO
     bool
-    select ISA_BUS
+    depends on ISA_BUS
     select PCKBD
     select PARALLEL
     select SERIAL_ISA
@@ -47,6 +47,7 @@ config PIIX
 
 config VT82C686
     bool
+    select ISA_BUS
     select ISA_SUPERIO
     select ACPI
     select ACPI_SMBUS