drm/i915/wm: Use intel_display structure in DPKGC code

Use intel_display for DPKGC code wherever we can. While we are
at it also use intel_de_rmw instead of intel_uncore_rmw as we
really don't need the internal uncore_rmw_function.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241203084706.2126189-3-suraj.kandpal@intel.com

Author: surajk8

drivers/gpu/drm/i915/display/skl_watermark.c

@@ -2857,26 +2857,27 @@ static int skl_wm_add_affected_planes(struct intel_atomic_state *state,
 static void
 skl_program_dpkgc_latency(struct drm_i915_private *i915, bool enable_dpkgc)
 {
+	struct intel_display *display = to_intel_display(&i915->drm);
 	u32 max_latency = LNL_PKG_C_LATENCY_MASK;
 	u32 clear, val;
 	u32 added_wake_time = 0;
 
-	if (DISPLAY_VER(i915) < 20)
+	if (DISPLAY_VER(display) < 20)
 		return;
 
 	if (enable_dpkgc) {
 		max_latency = skl_watermark_max_latency(i915, 1);
 		if (max_latency == 0)
 			max_latency = LNL_PKG_C_LATENCY_MASK;
 		added_wake_time = DSB_EXE_TIME +
-			i915->display.sagv.block_time_us;
+			display->sagv.block_time_us;
 	}
 
 	clear = LNL_ADDED_WAKE_TIME_MASK | LNL_PKG_C_LATENCY_MASK;
 	val = REG_FIELD_PREP(LNL_PKG_C_LATENCY_MASK, max_latency) |
 		REG_FIELD_PREP(LNL_ADDED_WAKE_TIME_MASK, added_wake_time);
 
-	intel_uncore_rmw(&i915->uncore, LNL_PKG_C_LATENCY, clear, val);
+	intel_de_rmw(display, LNL_PKG_C_LATENCY, clear, val);
 }
 
 static int