arm64: defconfig: Select CONFIG_CLK_IMX8MN by default

Enable CONFIG_CLK_IMX8MN to support i.MX8MN clock driver.
Signed-off-by: NAnson Huang <Anson.Huang@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/configs/defconfig

@@ -681,6 +681,7 @@ CONFIG_COMMON_CLK_S2MPS11=y
 CONFIG_CLK_QORIQ=y
 CONFIG_COMMON_CLK_PWM=y
 CONFIG_CLK_IMX8MM=y
+CONFIG_CLK_IMX8MN=y
 CONFIG_CLK_IMX8MQ=y
 CONFIG_CLK_IMX8QXP=y
 CONFIG_TI_SCI_CLK=y