[bsp/nxp/mcx/mcxa] Fix UART clock configuration type mismatch

Fixed implicit type conversion warning in UART driver by correctly
separating clock_name_t and clock_attach_id_t enum types.

Changes:
- Use kCLOCK_Fro12M (clock_name_t) for clock_src field
- Keep kFRO12M_to_LPUARTx (clock_attach_id_t) for clock_attach_id field
- Fix mcx_getc() to use correct status flag kLPUART_RxDataRegFullFlag

This resolves the compiler warning:
"implicit conversion from 'int' to 'clock_name_t' changes value from 16777216 to 0"

Signed-off-by: Yucai Liu 1486344514@qq.com

bsp/nxp/mcx/mcxa/Libraries/drivers/drv_uart.c

@@ -64,12 +64,12 @@ static const struct mcx_uart uarts[] =
         &serial0,
         LPUART0,
         LPUART0_IRQn,
+        kCLOCK_Fro12M,
 #if (defined(CPU_MCXA346VLH) || defined(CPU_MCXA346VLL) || defined(CPU_MCXA346VLQ) || defined(CPU_MCXA346VPN))
         kFRO_LF_DIV_to_LPUART0,
 #else
         kFRO12M_to_LPUART0,
 #endif
-        kFRO12M_to_LPUART0,
         kCLOCK_GateLPUART0,
         kCLOCK_DivLPUART0,
         "uart0",
@@ -80,12 +80,12 @@ static const struct mcx_uart uarts[] =
         &serial1,
         LPUART1,
         LPUART1_IRQn,
+        kCLOCK_Fro12M,
 #if (defined(CPU_MCXA346VLH) || defined(CPU_MCXA346VLL) || defined(CPU_MCXA346VLQ) || defined(CPU_MCXA346VPN))
         kFRO_LF_DIV_to_LPUART1,
 #else
         kFRO12M_to_LPUART1,
 #endif
-        kFRO12M_to_LPUART1,
         kCLOCK_GateLPUART1,
         kCLOCK_DivLPUART1,
         "uart1",
@@ -182,7 +182,7 @@ static int mcx_getc(struct rt_serial_device *serial)
 {
     struct mcx_uart *uart = (struct mcx_uart *)serial->parent.user_data;
 
-    if (kLPUART_RxDataRegFullInterruptEnable & LPUART_GetStatusFlags(uart->uart_base))
+    if (kLPUART_RxDataRegFullFlag & LPUART_GetStatusFlags(uart->uart_base))
     {
         return LPUART_ReadByte(uart->uart_base);
     }