UPSTREAM: drm/i915: Extract glk_need_scaler_clock_gating_wa()

Simplify our life by extracting the "do we need the glk scaler
clock gating w/a?" check into a small helper.

Reviewed-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240402135148.23011-5-ville.syrjala@linux.intel.com


(cherry picked from commit 7a3f171c)

BUG=b:308455498
TEST=Verify Asus PG32UQXR 4K160 mode on Rex using Big Joiner

Change-Id: If077e604560e9f6d49e74a964a05a11fdf5c47e3
Signed-off-by: Rakshith M O <rakshith.m.o@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5802855


Reviewed-by: Sean Paul <sean@poorly.run>
Reviewed-by: Manasi Navare <navaremanasi@chromium.org>
Signed-off-by: Hubert Mazur <hmazur@google.com>