vbox: add HAS_IOPORT dependency

The vboxguest driver depends on port I/O for debug output:

include/asm-generic/io.h:626:15: error: call to '_outl' declared with attribute error: outl() requires CONFIG_HAS_IOPORT
  626 | #define _outl _outl
include/asm-generic/io.h:663:14: note: in expansion of macro '_outl'
  663 | #define outl _outl
      |              ^~~~~
drivers/virt/vboxguest/vboxguest_utils.c:102:9: note: in expansion of macro 'outl'
  102 |         outl(phys_req, gdev->io_port + VMMDEV_PORT_OFF_REQUEST);
      |         ^~~~

Most arm64 platforms don't actually support port I/O, though it is
currently enabled unconditionally. Refine the vbox dependency to allow
turning HAS_IOPORT off in the future when building for platforms without
port I/O and allow compile-testing on all architectures.

Fixes: 5cf8f93 ("vbox: Enable VBOXGUEST and VBOXSF_FS on ARM64")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20250122065445.1469218-1-arnd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: arndb

drivers/virt/vboxguest/Kconfig

@@ -1,7 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config VBOXGUEST
 	tristate "Virtual Box Guest integration support"
-	depends on (ARM64 || X86) && PCI && INPUT
+	depends on (ARM64 || X86 || COMPILE_TEST) && PCI && INPUT
+	depends on HAS_IOPORT
 	help
 	  This is a driver for the Virtual Box Guest PCI device used in
 	  Virtual Box virtual machines. Enabling this driver will add