chore(virtio-mem): build CONFIG_VIRTIO_MEM in guest kernels

Update the Kconfig to enable support for virtio-mem in the guest.

Signed-off-by: Riccardo Mancini <[email protected]>

Author: Manciukic

resources/guest_configs/ci.config

@@ -11,4 +11,8 @@ CONFIG_SERIO_I8042=y
 CONFIG_SERIO_LIBPS2=y
 CONFIG_SERIO_GSCPS2=y
 CONFIG_KEYBOARD_ATKBD=y
-CONFIG_INPUT_KEYBOARD=y
+CONFIG_INPUT_KEYBOARD=y
+
+# virtio-mem support
+CONFIG_STRICT_DEVMEM=y
+CONFIG_VIRTIO_MEM=y