i2c: Reflect correct dependency for !DM cadence driver

Setup proper DM_I2C dependency.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 5366171..7579eb8 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -459,6 +459,7 @@
 config SYS_I2C_ZYNQ
 	bool "Xilinx I2C driver"
 	depends on ARCH_ZYNQMP || ARCH_ZYNQ
+	depends on !DM_I2C
 	help
 	  Support for Xilinx I2C controller.