UPSTREAM: drm/i915: Clean up glk_pipe_scaler_clock_gating_wa()

glk_pipe_scaler_clock_gating_wa() is messy. Clean it up via
intel_de_rmw(), and also just pass in the whole crtc so the
caller doesn't have to dance around so much.

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/20240402135148.23011-4-ville.syrjala@linux.intel.com


(cherry picked from commit c922a479)

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

Change-Id: Icb2f7fc3ddb65578ca8aefa374561eca3de86827
Signed-off-by: Rakshith M O <rakshith.m.o@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5802854


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