clk: imx: add clk driver for i.MX8QXP

Add clk driver for i.MX8QXP. This basic version supports clk
enable/disable/get_rate/set_rate operations for I2C, ENET,
SDHC0 and UART clocks.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 8bc9f52..f87c9ae 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -7,6 +7,7 @@
 
 obj-$(CONFIG_$(SPL_TPL_)CLK) += clk-uclass.o clk_fixed_rate.o
 
+obj-y += imx/
 obj-y += tegra/
 obj-$(CONFIG_ARCH_ASPEED) += aspeed/
 obj-$(CONFIG_ARCH_MESON) += clk_meson.o