bsps: Move libchip to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

bsps/shared/dev/serial/serprobe.c

@@ -0,0 +1,13 @@
+#include <rtems.h>
+#include <libchip/serial.h>
+#include <libchip/sersupp.h>
+
+bool libchip_serial_default_probe(int minor)
+{
+  /*
+   * If the configuration dependent probe has located the device then
+   * assume it is there
+   */
+
+  return true;
+}