i965: expose SRGB visuals and turn on EGL_KHR_gl_colorspace

Patch exposes sRGB visuals and adds DRI integer query support for
__DRI2_RENDERER_HAS_FRAMEBUFFER_SRGB. Further changes make sure that
we mark if the app explicitly wanted sRGB and for these framebuffers
we don't turn sRGB off in intel_gles3_srgb_workaround. This way we
keep compatibility for existing applications relying on default sRGB
and ony add more visual support.

With this change, following dEQP tests start to pass:

   dEQP-EGL.functional.wide_color.window_8888_colorspace_srgb
   dEQP-EGL.functional.wide_color.pbuffer_8888_colorspace_srgb

v2: some code cleanup (Emil Velikov)
    update num_formats correctly (reported by [email protected])

v3: cleanup, remove redundant is_srgb
    rename explicit_srgb as 'need_srgb' to follow style better

Signed-off-by: Tapani Pälli <[email protected]>
Reviewed-by: Emil Velikov <[email protected]> (v2)
Reviewed-by: Kenneth Graunke <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102264
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102354
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102503

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