fix the floder name bug

board/BearPi_STM32L431RC/BSP/Src/tickless/bsp_pm_device.c

@@ -0,0 +1,31 @@
+#include "tos.h"
+#include "mcu_init.h"
+
+#if TOS_CFG_PWR_MGR_EN > 0u
+
+static int pm_device_uart_init(void)
+{
+    return 0;
+}
+
+static int pm_device_uart_suspend(void)
+{
+    return 0;
+}
+
+static int pm_device_uart_resume(void)
+{
+    SystemClock_Config();
+
+    return 0;
+}
+
+k_pm_device_t pm_device_uart = {
+    .name       = "uart",
+    .init       = pm_device_uart_init,
+    .suspend    = pm_device_uart_suspend,
+    .resume     = pm_device_uart_resume,
+};
+
+#endif
+