feat(imx8m): enable the csu init on imx8m

Enable the CSU init on i.MX8M SoC family. The 'csu_cfg' array
is just a placeholder for now as example with limited config listed.
In real use case,user can add the CSU config as needed based on system design.

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Change-Id: I1f7999efa346f18f6625ed8c478d088ed75f7833
diff --git a/plat/imx/imx8m/imx8mm/imx8mm_bl31_setup.c b/plat/imx/imx8m/imx8mm/imx8mm_bl31_setup.c
index 71d7497..53ae33c 100644
--- a/plat/imx/imx8m/imx8mm/imx8mm_bl31_setup.c
+++ b/plat/imx/imx8m/imx8mm/imx8mm_bl31_setup.c
@@ -26,6 +26,7 @@
 #include <imx_uart.h>
 #include <imx_rdc.h>
 #include <imx8m_caam.h>
+#include <imx8m_csu.h>
 #include <plat_imx8.h>
 
 static const mmap_region_t imx_mmap[] = {
@@ -56,6 +57,20 @@
 	{0},
 };
 
+static const struct imx_csu_cfg csu_cfg[] = {
+	/* peripherals csl setting */
+	CSU_CSLx(0x1, CSU_SEC_LEVEL_0, UNLOCKED),
+
+	/* master HP0~1 */
+
+	/* SA setting */
+
+	/* HP control setting */
+
+	/* Sentinel */
+	{0}
+};
+
 static entry_point_info_t bl32_image_ep_info;
 static entry_point_info_t bl33_image_ep_info;
 
@@ -111,6 +126,8 @@
 
 	imx_rdc_init(rdc);
 
+	imx_csu_init(csu_cfg);
+
 	imx8m_caam_init();
 
 	console_imx_uart_register(IMX_BOOT_UART_BASE, IMX_BOOT_UART_CLK_IN_HZ,