anv: Handle VK_WHOLE_SIZE properly for buffer views

anv: Handle VK_WHOLE_SIZE properly for buffer views

The old calculation, which used view->offset, encorporated buffer->offset
into the size calculation where it doesn't belong.  This meant that, if
buffer->offset > buffer->size, you would always get a negative size.  This
fixes 170 dEQP-VK.renderpass.attachment.* Vulkan CTS tests on Haswell.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>
Cc: "12.0" <mesa-stable@lists.freedesktop.org>