media: bcm2835-unicam: change minimum number of vb2_queue buffers to 1
Since the unicam driver was modified to write to a dummy buffer when no
user-supplied buffer is available, it can now write to and return a
buffer even when there's only a single one. Enable this by changing the
min_buffers_needed in the vb2_queue; it will be useful for enabling
still captures without allocating more memory than absolutely necessary.
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
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