media: videobuf2: Drop minimum allocation requirement of 2 buffers

When introducing the ability for drivers to indicate the minimum number
of buffers they require an application to allocate, commit 6662edcd32cc
("media: videobuf2: Add min_reqbufs_allocation field to vb2_queue
structure") also introduced a global minimum of 2 buffers. It turns out
this breaks the Renesas R-Car VSP test suite, where a test that
allocates a single buffer fails when two buffers are used.

One may consider debatable whether test suite failures without failures
in production use cases should be considered as a regression, but
operation with a single buffer is a valid use case. While full frame
rate can't be maintained, memory-to-memory devices can still be used
with a decent efficiency, and requiring applications to allocate
multiple buffers for single-shot use cases with capture devices would
just waste memory.

For those reasons, fix the regression by dropping the global minimum of
buffers. Individual drivers can still set their own minimum.

Fixes: 6662edcd32cc ("media: videobuf2: Add min_reqbufs_allocation field to vb2_queue structure")
Cc: [email protected]
Signed-off-by: Laurent Pinchart <[email protected]>
Reviewed-by: Hans Verkuil <[email protected]>
Acked-by: Tomasz Figa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Laurent Pinchart <[email protected]>

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