refactor(imx8mn): make use of setup_page_tables()

No functional change.

Use the setup_page_tables() helper function which does the three calls
for us. Also the function has some logging support which will be nice
during debugging.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Change-Id: I2f0182f19300a3a57bbeb7e2107c5fb5525dd0c1
diff --git a/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c b/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
index 6d8027c..34ee5bc 100644
--- a/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
+++ b/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
@@ -202,11 +202,7 @@
 		{0}
 	};
 
-	mmap_add(bl_regions);
-	mmap_add(imx_mmap);
-
-	init_xlat_tables();
-
+	setup_page_tables(bl_regions, imx_mmap);
 	enable_mmu_el3(0);
 }