fix(uart): replacing #if #endif by #if #elif #endif for the same enum

Author: SuGlider

cores/esp32/HardwareSerial.h

@@ -103,11 +103,9 @@ typedef enum {
 #endif
 #if SOC_UART_SUPPORT_PLL_F40M_CLK
     UART_CLK_SRC_PLL = UART_SCLK_PLL_F40M,
-#endif
-#if SOC_UART_SUPPORT_PLL_F80M_CLK
+#elif SOC_UART_SUPPORT_PLL_F80M_CLK
     UART_CLK_SRC_PLL = UART_SCLK_PLL_F80M,
-#endif
-#if CONFIG_IDF_TARGET_ESP32H2
+#elif CONFIG_IDF_TARGET_ESP32H2
     UART_CLK_SRC_PLL = UART_SCLK_PLL_F48M,
 #endif
 #if SOC_UART_SUPPORT_XTAL_CLK