uxa: Force alpha bits to fill remaining bits

In the case of x8r8g8b8 and similar where the alpha channel is ignored,
but should be interpreted as being 1, then it is convenient if those bits
are set appropriately in the colour. In order to do so for these formats,
where PIXMAN_FORMAT_A() returns 0 we need to compute the alpha channel
width as the remaining bits instead.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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