drm/i915: Extract intel_crtc_vblank_evade_scanlines()

[ Upstream commit f4b0cece ]

Pull the vblank evasion scanline calculations into their own helper
to declutter intel_pipe_update_start() a bit.

Reviewed-by: Manasi Navare <navaremanasi@chromium.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230901130440.2085-4-ville.syrjala@linux.intel.com


Reviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Stable-dep-of: 4a36e46d ("drm/i915: Disable live M/N updates when using bigjoiner")
Signed-off-by: Sasha Levin <sashal@kernel.org>