Remove deprecated spec style embedded bindings

[savitaashture]

Changes

Removed deprecated embedded bindings spec style
Closes: #782

Signed-off-by: Savita Ashture sashture@redhat.com

/cc @dibyom

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• Includes tests (if functionality changed/added)
• Includes docs (if user facing)
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Release Notes

BREAKING CHANGE: 

The `Spec` field has been removed from the `TriggerSpecBinding`.

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1alpha1/trigger_validation.go	94.2%	94.0%	-0.2
test/builder/eventlistener.go	88.4%	91.5%	3.1
test/builder/trigger.go	93.6%	93.0%	-0.6

[dibyom]

/approve
/lgtm

[tekton-robot]

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