ForceDark: IWYU

Was breaking linux_musl targets when running
'm haiku'

Bug: 307611931
Test: N/A
Change-Id: Ic7c5aa2c106406d6973009fbc0203c1eded84fa5
diff --git a/libs/hwui/utils/ForceDark.h b/libs/hwui/utils/ForceDark.h
index 28538c4b..ecfe41f 100644
--- a/libs/hwui/utils/ForceDark.h
+++ b/libs/hwui/utils/ForceDark.h
@@ -17,6 +17,8 @@
 #ifndef FORCEDARKUTILS_H
 #define FORCEDARKUTILS_H
 
+#include <stdint.h>
+
 namespace android {
 namespace uirenderer {
 
@@ -26,9 +28,9 @@
  * This should stay in sync with the java @IntDef in
  * frameworks/base/graphics/java/android/graphics/ForceDarkType.java
  */
-enum class ForceDarkType : __uint8_t { NONE = 0, FORCE_DARK = 1, FORCE_INVERT_COLOR_DARK = 2 };
+enum class ForceDarkType : uint8_t { NONE = 0, FORCE_DARK = 1, FORCE_INVERT_COLOR_DARK = 2 };
 
 } /* namespace uirenderer */
 } /* namespace android */
 
-#endif  // FORCEDARKUTILS_H
\ No newline at end of file
+#endif  // FORCEDARKUTILS_H