console: rename vga_hw_*, add QemuConsole param

Add QemuConsole parameter to vga_hw_*, so the interface allows to update
non-active consoles (the actual code can't handle this yet, see next
patch).  Passing NULL is allowed and updates the active console, like
the functions do today.

While touching all vga_hw_* calls anyway rename that to the functions to
hardware-neutral graphics_hw_*

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index 930b7cf..247209d 100644
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -1074,7 +1074,7 @@
     qemu_spice_create_host_primary(&d->ssd);
     d->mode = QXL_MODE_VGA;
     vga_dirty_log_start(&d->vga);
-    vga_hw_update();
+    graphic_hw_update(d->vga.con);
 }
 
 static void qxl_exit_vga_mode(PCIQXLDevice *d)