add RF_TXCO_EN on PH1 and set HSI calibration to its default value

targets/TARGET_STM/TARGET_STM32L1/TARGET_MTB_RAK811/PinNames.h

@@ -106,6 +106,7 @@ typedef enum {
     ANT_CTX_PA  = PA_4,
     ANT_CRX_RX  = PB_6,
     ANT_CBT_HF  = PB_7,
+    RF_TCXO_EN  = PH_1,
 
     SPI_MISO    = PB_4,
     SPI_MOSI    = PB_5,

targets/TARGET_STM/TARGET_STM32L1/TARGET_MTB_RAK811/device/system_clock.c

@@ -123,6 +123,7 @@ uint8_t SetSysClock_PLL_HSI(void)
     RCC_OscInitStruct.OscillatorType      = RCC_OSCILLATORTYPE_HSI;
     RCC_OscInitStruct.HSEState            = RCC_HSE_OFF;
     RCC_OscInitStruct.HSIState            = RCC_HSI_ON;
+    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
     // SYSCLK = 32 MHz ((16 MHz * 4) / 2)
     // USBCLK = 64 MHz (16 MHz * 4) --> USB not possible
     RCC_OscInitStruct.PLL.PLLState        = RCC_PLL_ON;