imx9: clock: add CONFIG_IMX9_LOW_DRIVE_MODE support

Add CONFIG_IMX9_LOW_DRIVE_MODE in imx9 clk, later we will
add board support

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx9/Kconfig b/arch/arm/mach-imx/imx9/Kconfig
index c06102b..c51f80f 100644
--- a/arch/arm/mach-imx/imx9/Kconfig
+++ b/arch/arm/mach-imx/imx9/Kconfig
@@ -5,6 +5,11 @@
     help
     This option enables the support for AHAB secure boot.
 
+config IMX9_LOW_DRIVE_MODE
+    bool "Configure to i.MX9 low drive mode"
+    help
+    This option enables the settings for iMX9 low drive mode.
+
 config IMX9
 	bool
 	select HAS_CAAM