anv: fix up dynamic clip emission

There were 2 issues :

   * We were not emitting the clip state when the pipeline changed

   * On Gen7 we did not program the front facing & cull mode dynamic
     values in the clip state

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: c34d8ac2 ("anv: handle dynamic viewport count")
Closes mesa/mesa#3379

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <mesa/mesa!6265>
31 jobs for !6265 with review/anv-dynamic-clip-fix in 9 minutes and 8 seconds (queued for 3 seconds)
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  Container+Docs
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aarch64
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ppc64el_build

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x86_build

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x86_test-gl

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meson-testing

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  Meson Misc
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aarch64
meson-arm64

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aarch64
meson-arm64-build-test

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aarch64
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meson-i386

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meson-mingw32-x86_64

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kvm
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kvm
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