pos-input-surface: Delay initial key submission
Wait until phosh is hopefully up.
Improves 353e39a8 ("input-surface: Make sure we have an input serial")
I intend to merge this earlh in the cycle so it gets testing. If it still isn't reliable we need to track phosh's state (but as it's a workaround in the first place I'd rather drop it).
Signed-off-by: Guido Günther agx@sigxcpu.org