nitrogem8m: remove ddr, mv ddr/lpddr4_timing.c up

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>

board/boundary/nitrogen8m/Makefile

@@ -9,5 +9,4 @@ obj-y += nitrogen8m.o mmc.o
 ifdef CONFIG_SPL_BUILD
 obj-y += spl.o
 obj-y += lpddr4_timing.o
-obj-y += ddr/lpddr4_timing.o
 endif

board/boundary/nitrogen8m/ddr/ddr.h

-/*
- * Copyright 2017 NXP
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-void ddr_init1(struct dram_timing_info *dram_timing);
-extern struct dram_timing_info lpddr4_timing_;
-void lpddr4_cfg_umctl2(struct dram_cfg_param *ddrc_cfg, int num);

board/boundary/nitrogen8m/spl.c

@@ -23,14 +23,13 @@
 #ifdef CONFIG_IMX8M_LPDDR4
 #include <asm/arch/imx8m_ddr.h>
 #endif
-#include "ddr/ddr.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
 void spl_dram_init(void)
 {
 	/* ddr init */
-	ddr_init(&lpddr4_timing_);
+	ddr_init(&lpddr4_timing);
 }
 
 #define I2C_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_HYS | PAD_CTL_PUE)