hcd/ehci: hcd_edpt_open() return false if ep is already opened. implement hcd_edpt_close()

hw/bsp/imxrt/family.c

@@ -61,7 +61,7 @@
   - Define CFG_TUSB_MEM_SECTION=__attribute__((section("NonCacheable")))
 */
 
-static void BOARD_ConfigMPU(void);
+// static void BOARD_ConfigMPU(void);
 
 // needed by fsl_flexspi_nor_boot
 TU_ATTR_USED const uint8_t dcd_data[] = {0x00};
@@ -456,7 +456,7 @@ static void BOARD_ConfigMPU(void) {
 
 #elif __CORTEX_M == 4
 
-void BOARD_ConfigMPU(void) {
+static void BOARD_ConfigMPU(void) {
   #if defined(__CC_ARM) || defined(__ARMCC_VERSION)
   extern uint32_t Image$$RW_m_ncache$$Base[];
   /* RW_m_ncache_unused is a auxiliary region which is used to get the whole size of noncache section */