feat(uart): apply default LP uart clock source

Author: SuGlider

cores/esp32/esp32-hal-uart.c

@@ -1158,13 +1158,14 @@ bool uartSetClockSource(uart_t *uart, uart_sclk_t clkSrc) {
   if (uart->num >= SOC_UART_HP_NUM) {
     switch (clkSrc) {
       case UART_SCLK_XTAL:
-        uart->_uart_clock_source = SOC_MOD_CLK_XTAL_D2;
+        uart->_uart_clock_source = LP_UART_SCLK_XTAL_D2;
         break;
       case UART_SCLK_RTC:
-        uart->_uart_clock_source = SOC_MOD_CLK_RTC_FAST;
+        uart->_uart_clock_source = LP_UART_SCLK_LP_FAST;
         break;
+      case UART_SCLK_DEFAULT:
       default:
-        uart->_uart_clock_source = -1;
+        uart->_uart_clock_source = LP_UART_SCLK_DEFAULT;
     }
   } else
 #endif