clk: imx8mn: Fix incorrect clock defines
IMX8MN_CLK_I2C4 and IMX8MN_CLK_UART1's index definitions are incorrect,
fix them.
Fixes: 1e80936a42e1 ("dt-bindings: imx: Add clock binding doc for i.MX8MN")
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
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