nitrogen8m_som: s/lpddr4_timing/dram_timing/

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

board/boundary/nitrogen8m_som/lpddr4_timing.c

@@ -1250,7 +1250,7 @@ static struct dram_fsp_msg lpddr4_dram_fsp_msg[] = {
 #endif
 };
 
-struct dram_timing_info lpddr4_timing = {
+struct dram_timing_info dram_timing = {
 	.ddrc_cfg = lpddr4_ddrc_cfg,
 	.ddrc_cfg_num = ARRAY_SIZE(lpddr4_ddrc_cfg),
 	.ddrphy_cfg = lpddr4_ddrphy_cfg,

board/boundary/nitrogen8m_som/spl.c

@@ -29,7 +29,7 @@ DECLARE_GLOBAL_DATA_PTR;
 void spl_dram_init(void)
 {
 	/* ddr init */
-	ddr_init(&lpddr4_timing);
+	ddr_init(&dram_timing);
 }
 
 #define I2C_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_HYS | PAD_CTL_PUE)