soc: nxp_imx: Use generated clock controller in dts fixup

Use the generated "_CLOCK_CONTROLLER" macro for the lpuart clock name.
This change is similar to commit
e81d9b9, but applied to nxp_imx.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>

soc/arm/nxp_imx/rt/dts.fixup

@@ -30,7 +30,7 @@
 #define CONFIG_UART_MCUX_LPUART_1_IRQ		NXP_KINETIS_LPUART_40184000_IRQ_0
 #define CONFIG_UART_MCUX_LPUART_1_IRQ_PRI	NXP_KINETIS_LPUART_40184000_IRQ_0_PRIORITY
 #define CONFIG_UART_MCUX_LPUART_1_BAUD_RATE	NXP_KINETIS_LPUART_40184000_CURRENT_SPEED
-#define CONFIG_UART_MCUX_LPUART_1_CLOCK_NAME	NXP_IMX_CCM_400FC000_LABEL
+#define CONFIG_UART_MCUX_LPUART_1_CLOCK_NAME	NXP_KINETIS_LPUART_40184000_CLOCK_CONTROLLER
 #define CONFIG_UART_MCUX_LPUART_1_CLOCK_SUBSYS	NXP_KINETIS_LPUART_40184000_CLOCK_NAME
 
 /* End of SoC Level DTS fixup file */