system/uorb: fix compile warning

1. add string.h becuase strlen in uORB.c
2. add inttypes.h becuase PRIu64/... in sensor/*.c

Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>

system/uorb/uORB/uORB.c

@@ -28,6 +28,7 @@
 #include <sys/ioctl.h>
 #include <time.h>
 #include <unistd.h>
+#include <string.h>
 
 #include <nuttx/streams.h>
 #include <uORB/uORB.h>

system/uorb/uORB/uORB.h

@@ -36,6 +36,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <syslog.h>
+#include <inttypes.h>
 
 /****************************************************************************
  * Public Types