imx: imx8mp: add basic clock

i.MX8MP has similar architecture as i.MX8MN, but it has different
clk root and index, so add that to make i.MX8MP could use
the non-dm clock driver.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/include/asm/arch-imx8m/clock.h b/arch/arm/include/asm/arch-imx8m/clock.h
index c910b61..87cc4d3 100644
--- a/arch/arm/include/asm/arch-imx8m/clock.h
+++ b/arch/arm/include/asm/arch-imx8m/clock.h
@@ -9,7 +9,8 @@
 
 #ifdef CONFIG_IMX8MQ
 #include <asm/arch/clock_imx8mq.h>
-#elif defined(CONFIG_IMX8MM) || defined(CONFIG_IMX8MN)
+#elif defined(CONFIG_IMX8MM) || defined(CONFIG_IMX8MN) || \
+	defined(CONFIG_IMX8MP)
 #include <asm/arch/clock_imx8mm.h>
 #else
 #error "Error no clock.h"