drm/i915: make __intel_display_power_is_enabled() static

The function isn't used outside of intel_display_power.c. Make it
static.
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240813151216.2573845-1-jani.nikula@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -198,20 +198,8 @@ intel_display_power_domain_str(enum intel_display_power_domain domain)
 	}
 }
 
-/**
- * __intel_display_power_is_enabled - unlocked check for a power domain
- * @dev_priv: i915 device instance
- * @domain: power domain to check
- *
- * This is the unlocked version of intel_display_power_is_enabled() and should
- * only be used from error capture and recovery code where deadlocks are
- * possible.
- *
- * Returns:
- * True when the power domain is enabled, false otherwise.
- */
-bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
-				      enum intel_display_power_domain domain)
+static bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
+					     enum intel_display_power_domain domain)
 {
 	struct i915_power_well *power_well;
 	bool is_enabled;

drivers/gpu/drm/i915/display/intel_display_power.h

@@ -188,8 +188,6 @@ intel_display_power_domain_str(enum intel_display_power_domain domain);
 
 bool intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
 				    enum intel_display_power_domain domain);
-bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
-				      enum intel_display_power_domain domain);
 intel_wakeref_t intel_display_power_get(struct drm_i915_private *dev_priv,
 					enum intel_display_power_domain domain);
 intel_wakeref_t