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 <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

include/uapi/regulator/regulator.h

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