i965: Fix calculation of the image height at start level

i965: Fix calculation of the image height at start level

- Fixes CTS tests:

* GL44-CTS.shader_image_size.advanced-nonMS-cs-float
* GL44-CTS.shader_image_size.advanced-nonMS-cs-int
* GL44-CTS.shader_image_size.advanced-nonMS-cs-uint
* GL44-CTS.shader_image_size.advanced-nonMS-gs-float
* GL44-CTS.shader_image_size.advanced-nonMS-gs-int
* GL44-CTS.shader_image_size.advanced-nonMS-gs-uint
* GL44-CTS.shader_image_size.advanced-nonMS-tes-float
* GL44-CTS.shader_image_size.advanced-nonMS-tes-int
* GL44-CTS.shader_image_size.advanced-nonMS-tes-uint
* GL44-CTS.shader_image_size.advanced-nonMS-vs-float
* GL44-CTS.shader_image_size.advanced-nonMS-vs-int
* GL44-CTS.shader_image_size.advanced-nonMS-vs-uint

v1: (written by Dave Airlie) Always shift height images for levels.
Fixed the CTS test.

v2: Only shift height if the texture is not an 1D_ARRAY,
it fixes assertion in GL44-CTS.texture_view.gettexparameter
due to the original patch (Antia).

v3: Remove the loop. Do not shift height either for 1D textures.
Use an explicit switch and add an assertion (levels == 0) for
multisampled textures (Jason).

v4: Rectangle textures can not have levels either (Ilia Mirkin).

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Antia Puentes <apuentes@igalia.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>