perf intel-pt: Prefer get_unaligned_le64 to memcpy_le64

Use get_unaligned_le64() instead of memcpy_le64(..., 8) because it produces
simpler code.

Signed-off-by: Adrian Hunter <[e-mail]>
Acked-by: Ian Rogers <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c

···
 	if (len < 11)
 		return INTEL_PT_NEED_MORE_BYTES;
 	packet->type = INTEL_PT_MNT;
-	memcpy_le64(&packet->payload, buf + 3, 8);
+	packet->payload = get_unaligned_le64(buf + 3);
 	return 11;
 }
 
···
 		return INTEL_PT_NEED_MORE_BYTES;
 	packet->type = INTEL_PT_BIP;
 	packet->count = buf[0] >> 3;
-	memcpy_le64(&packet->payload, buf + 1, 8);
+	packet->payload = get_unaligned_le64(buf + 1);
 	return 9;
 }
 
···
 	packet->type = INTEL_PT_EVD;
 	packet->count = buf[2] & 0x3f;
 	packet->payload = buf[3];
-	memcpy_le64(&packet->payload, buf + 3, 8);
+	packet->payload = get_unaligned_le64(buf + 3);
 	return 11;
 }