media: cec/core: handle core events like normal events

Currently there is a distinction between core events
(CEC_EVENT_STATE_CHANGE and CEC_EVENT_LOST_MSGS) and other
events. The core events do not require memory allocations,
so are a bit faster, but they are also limited to just a
single event: if a new event comes in, then that replaces
the old one.

It's all overly complicated, and with only one state change
event it is easy to miss state changes.

So just drop that optimization, and allow for up to 3
state change events.

Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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