anv: fix bug when using component qualifier in FS outputs

anv: fix bug when using component qualifier in FS outputs

We can write to the same output but in different components, like
in this example:

layout(location = 0, component = 0) out ivec2 dEQP_FragColor_0;
layout(location = 0, component = 2) out ivec2 dEQP_FragColor_1;

Therefore, they are not two different outputs but only one.

Fixes:

dEQP-VK.glsl.440.linkage.varying.component.frag_out.*

v3:
- Remove FRAG_RESULT_MAX.
- Add const and use sizeof (Ian).
- Do three-pass to set properly the locations of fragment
  outputs when having arrays (Jason).

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>