ANGLE reserves 2 uniforms and 2 varyings for GLES.
Increasing maxPerStageDescriptorUniformBuffers by 2 and
maxVertexOutputComponents by 8 (2 * 4 components) allows
the following tests to pass (17 failures fixed in total):
dEQP-GLES3.functional.implementation_limits.*
dEQP-GLES3.functional.state_query.*

Bug b/141632907

Change-Id: Ie39b735286d6682f5782fca30e0f7a079f4142ec
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/36668
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>