fix bug that phy_enter_critical cannot effect on dual-core

Sometimes, libphy.a call phy_enter_critical() to protect accessing critical sections, such like
operating on I2C, but it may not effect when both the CPU core call it. It may cause accessing
I2C blocking and cannot recover by esp_restart(), until do HW reboot.

components/esp32/phy_init.c

@@ -67,14 +67,27 @@ static _lock_t s_modem_sleep_lock;
 /* time stamp updated when the PHY/RF is turned on */
 static int64_t s_phy_rf_en_ts = 0;
 
+static DRAM_ATTR portMUX_TYPE s_phy_int_mux = portMUX_INITIALIZER_UNLOCKED;
+
 uint32_t IRAM_ATTR phy_enter_critical(void)
 {
-    return portENTER_CRITICAL_NESTED();
+    if (xPortInIsrContext()) {
+        portENTER_CRITICAL_ISR(&s_phy_int_mux);
+    } else {
+        portENTER_CRITICAL(&s_phy_int_mux);
+    }
+    // Interrupt level will be stored in current tcb, so always return zero.
+    return 0;
 }
 
 void IRAM_ATTR phy_exit_critical(uint32_t level)
 {
-    portEXIT_CRITICAL_NESTED(level);
+    // Param level don't need any more, ignore it.
+    if (xPortInIsrContext()) {
+        portEXIT_CRITICAL_ISR(&s_phy_int_mux);
+    } else {
+        portEXIT_CRITICAL(&s_phy_int_mux);
+    }
 }
 
 int64_t esp_phy_rf_get_on_ts(void)