isp: Split the viewfinder and snapshot API

Don't suspend and resume the viewfinder implicitly when taking a
snapshot, but let the application stop the viewfinder before taking the
snapshot, and restart it afterwards.

Applications are now responsible for keeping track of the viewfinder
output buffers state and pass of bitmask of output buffers indices to be
queued when starting the viewfinder.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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