hw/i386: also turn off VMMOUSE is VMPORT is disabled

Commit 97fd1ea broke the build for --without-default-devices as
VMMOUSE depends on VMPORT.

Fixes: 97fd1ea
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

hw/i386/Kconfig

@@ -52,14 +52,14 @@ config I440FX
     bool
     imply E1000_PCI
     imply VMPORT
+    imply VMMOUSE
     select PC_PCI
     select PC_ACPI
     select ACPI_SMBUS
     select PCI_PIIX
     select IDE_PIIX
     select DIMM
     select SMBIOS
-    select VMMOUSE
     select FW_CFG_DMA
 
 config ISAPC
@@ -78,14 +78,14 @@ config Q35
     imply AMD_IOMMU
     imply E1000E_PCI_EXPRESS
     imply VMPORT
+    imply VMMOUSE
     select PC_PCI
     select PC_ACPI
     select PCI_EXPRESS_Q35
     select LPC_ICH9
     select AHCI_ICH9
     select DIMM
     select SMBIOS
-    select VMMOUSE
     select FW_CFG_DMA
 
 config VTD