drm/i915/display: Refactor DPKGC code to call it from atomic_commit_tail

Refactor the code to check the fixed refresh rate condition in the dpkgc
function itself and call it from intel_atomic_commit_tail so that we
have all the required values specially linetime which is computed after
intel_wm_compute, this will also help implement some WA's which requires
linetime. This also avoid writing into any of the registers while we are
in compute_config phase.

Signed-off-by: Suraj Kandpal <[email protected]>
Reviewed-by: Mitul Golani <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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