imx9: correct getting LPI2C clk

LPI2C_CLK_ROOT should be used instead of LPUART_CLK_ROOT for i2c

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx9/clock.c b/arch/arm/mach-imx/imx9/clock.c
index f602150..a0efee9 100644
--- a/arch/arm/mach-imx/imx9/clock.c
+++ b/arch/arm/mach-imx/imx9/clock.c
@@ -574,7 +574,7 @@
 	if (i2c_num > 7)
 		return -EINVAL;
 
-	return ccm_clk_root_get_rate(LPUART1_CLK_ROOT + i2c_num);
+	return ccm_clk_root_get_rate(LPI2C1_CLK_ROOT + i2c_num);
 }
 
 u32 get_lpuart_clk(void)