T4.1 - Serial8 is on pins 34 and 35

Serial8 is now defined for T4.1.

Previously it was defined for T4B1, but went away on T4B2 and released.  It is now defined on the T4.1

teensy4/HardwareSerial.cpp

 
 #define UART_CLOCK 24000000
 
-#if defined(__IMXRT1052__)   
+#if defined(ARDUINO_TEENSY41)   
 SerialEventCheckingFunctionPointer HardwareSerial::serial_event_handler_checks[8] = {nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr};
 #else
 SerialEventCheckingFunctionPointer HardwareSerial::serial_event_handler_checks[7] = {nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr};

teensy4/HardwareSerial.h

 	extern void IRQHandler_Serial5();
 	extern void IRQHandler_Serial6();
 	extern void IRQHandler_Serial7();
-	#if defined(__IMXRT1052__)   
+	#if defined(ARDUINO_TEENSY41)   
 	extern void IRQHandler_Serial8();
 	#endif
 }
 	friend void IRQHandler_Serial5();
 	friend void IRQHandler_Serial6();
 	friend void IRQHandler_Serial7();
-	#if defined(__IMXRT1052__)   
+	#if defined(ARDUINO_TEENSY41)   
 	friend void IRQHandler_Serial8();
 	static SerialEventCheckingFunctionPointer serial_event_handler_checks[8];
 	#else	
 extern void serialEvent6(void);
 extern void serialEvent7(void);
 
-	#if defined(__IMXRT1052__)   
+	#if defined(ARDUINO_TEENSY41)   
 extern HardwareSerial Serial8;
 extern void serialEvent8(void);
 #endif

teensy4/HardwareSerial8.cpp

 
 #include <Arduino.h>
 #include "HardwareSerial.h"
-#if defined(__IMXRT1052__)   
+#if defined(__IMXRT1062__) && defined(ARDUINO_TEENSY41)
 
 #ifndef SERIAL8_TX_BUFFER_SIZE
 #define SERIAL8_TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
 static HardwareSerial::hardware_t UART5_Hardware = {
 	7, IRQ_LPUART5, &IRQHandler_Serial8, &serial_event_check_serial8,
 	CCM_CCGR3, CCM_CCGR3_LPUART5(CCM_CCGR_ON),
-	{{30,2, &IOMUXC_LPUART5_RX_SELECT_INPUT, 0}, {0xff, 0xff, nullptr, 0}},
-	{{31,2, nullptr, 0}, {0xff, 0xff, nullptr, 0}},
+    {{34,1, &IOMUXC_LPUART5_RX_SELECT_INPUT, 1}, {0xff, 0xff, nullptr, 0}},
+    {{35,1, &IOMUXC_LPUART5_TX_SELECT_INPUT, 1}, {0xff, 0xff, nullptr, 0}},
+
 	0xff, // No CTS pin
 	0, // No CTS
 	IRQ_PRIORITY, 38, 24, // IRQ, rts_low_watermark, rts_high_watermark