egl: Fix OpenGL ES version checks in _eglParseContextAttribList()

We would generate EGL_BAD_CONFIG because _eglGetContextAPIBit
returns zero for the combination of EGL_OPENGL_ES_API and a major
version > 3.  By just returning zero, the caller can't tell the
difference between a bad version (which should generate
EGL_BAD_MATCH) and a bad API (which should generate
EGL_BAD_CONFIG).  This patch causes us to filter out major
versions > 3 at a point where we can generate the correct error.

Fixes gles3 Khronos CTS test:
egl_create_context.egl_create_context

V2: Fix commit message as suggested by Ian.

Cc: <[email protected]>
Signed-off-by: Anuj Phogat <[email protected]>
Reviewed-by: Tapani Pälli <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

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