ivi-layout: make sure the rectangle calculated by...

ivi-layout: make sure the rectangle calculated by calc_inverse_matrix_transform() is never too small

It's ok if the rectangle is too large: If the calculation fails, the
bounding rectangle is used anyways. However, a rectangle that is too small
will create incorrect results. So make sure to round all edges outwards.

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
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