vsp-lib: Reset controls to defaults on each test run

Some of our tests set flipping and rotation controls, and the VSP
instance can be used again by later tests. If these controls are not
reset, then that operation is applied to later tests incorrectly causing
those tests to fail.

In an ideal world, tests should clean up after themselves, and leave the
system in a known state. However the world is not ideal and we would not
be able to guarantee any previous system state before a test was run
anyway. Therefore it is more effective to reset state at the beginning
of a test.

To repair this - reset all control values to their defaults at the start
of every test during test_init()

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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