ES3: Add some missing unsized formats to the format tables.
ES3: Add some missing unsized formats to the format tables.

These were causing validation errors in the dEQP FBO tests.
See Table 3.2 in the ES3 spec.

BUG=angleproject:1074
TEST=dEQP-GLES3.functional.fbo.completeness.renderable.texture.color0.*

Change-Id: Ifbf9199c54060eb3fc1a1dac7bbd74e19e013c61
Reviewed-on: https://chromium-review.googlesource.com/286773
Reviewed-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>
Tested-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

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