cmake: Set NO_QEMU_SERIAL_BT_SERVER when CONFIG_BT_NO_DRIVER is set

When not driver is selected there should be no need to have a serial
attached.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

cmake/emu/qemu.cmake

@@ -64,6 +64,9 @@ endif()
 # Add a BT serial device when building for bluetooth, unless the
 # application explicitly opts out with NO_QEMU_SERIAL_BT_SERVER.
 if(CONFIG_BT)
+  if(CONFIG_BT_NO_DRIVER)
+      set(NO_QEMU_SERIAL_BT_SERVER 1)
+  endif()
   if(NOT NO_QEMU_SERIAL_BT_SERVER)
     list(APPEND QEMU_FLAGS -serial unix:/tmp/bt-server-bredr)
   endif()