DM: add deinit function to virtual keyboard device

old code has no deinit functionality for virtual keyboard device.
Which will trigger resource leak when system is reboot.

deinit function is added to:
1. deinit low ps2 based keyboard and mouse
2. release memory/io resource of virtual keyboard device
NOTE: IRQ resource will be handed in pci irq module

Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Eddie Dong <Eddie.dong@intel.com>

devicemodel/core/main.c

@@ -542,6 +542,7 @@ do_close_post(struct vmctx *ctx)
 {
 	pci_irq_deinit(ctx);
 	deinit_pci(ctx);
+	atkbdc_deinit(ctx);
 	vm_destroy(ctx);
 	vm_close(ctx);
 }