i965: Fix blorp clear of layered framebuffers.
i965: Fix blorp clear of layered framebuffers.

From section 4.4.7 (Layered Framebuffers) of the GLSL 3.2 spec:

    When the Clear or ClearBuffer* commands are used to clear a
    layered framebuffer attachment, all layers of the attachment are
    cleared.

This patch fixes the blorp clear path for color buffers.

Fixes piglit test "spec/!OpenGL 3.2/layered-rendering/clear-color".

Cc: "10.0" <mesa-stable@lists.freedesktop.org>

Reviewed-by: Eric Anholt <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@anholt.net>
Reviewed-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>

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