clk: imx8: add i.MX8QM clk driver

Add i.MX8QM clk driver, SDHC/FEC/UART/I2C supported.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile
index d07d91b..eb379c1 100644
--- a/drivers/clk/imx/Makefile
+++ b/drivers/clk/imx/Makefile
@@ -6,4 +6,5 @@
 
 ifdef CONFIG_CLK_IMX8
 obj-$(CONFIG_IMX8QXP) += clk-imx8qxp.o
+obj-$(CONFIG_IMX8QM) += clk-imx8qm.o
 endif