perf memswap: Adopt 'struct u64_swap' from evsel.h

As it is not used in evsel.h and is a memory swap struct, so fits better
in memswap.h.

Cc: Adrian Hunter <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: acmel

tools/perf/util/evsel.h

@@ -179,11 +179,6 @@ struct evsel {
 	} side_band;
 };
 
-union u64_swap {
-	u64 val64;
-	u32 val32[2];
-};
-
 struct perf_missing_features {
 	bool sample_id_all;
 	bool exclude_guest;

tools/perf/util/memswap.h

@@ -2,6 +2,13 @@
 #ifndef PERF_MEMSWAP_H_
 #define PERF_MEMSWAP_H_
 
+#include <linux/types.h>
+
+union u64_swap {
+	u64 val64;
+	u32 val32[2];
+};
+
 void mem_bswap_64(void *src, int byte_size);
 void mem_bswap_32(void *src, int byte_size);