regulator: uapi: Use UAPI integer type

Using libc types and headers from the UAPI headers is problematic as it
introduces a dependency on a full C toolchain.

Use the fixed-width integer type provided by the UAPI headers instead.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://patch.msgid.link/20251222-uapi-regulator-v1-1-a71c66eb1a94@linutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: t-8ch

include/uapi/regulator/regulator.h

@@ -8,11 +8,7 @@
 #ifndef _UAPI_REGULATOR_H
 #define _UAPI_REGULATOR_H
 
-#ifdef __KERNEL__
 #include <linux/types.h>
-#else
-#include <stdint.h>
-#endif
 
 /*
  * Regulator notifier events.
@@ -62,7 +58,7 @@
 
 struct reg_genl_event {
 	char reg_name[32];
-	uint64_t event;
+	__u64 event;
 };
 
 /* attributes of reg_genl_family */