board_f: Rename initdram() to dram_init()

This allows us to use the same DRAM init function on all archs. Add a
dummy function for arc, which does not use DRAM init here.

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Dummy function on nios2]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/ddr/fsl/main.c b/drivers/ddr/fsl/main.c
index 9aa3eec..d0a7b3f 100644
--- a/drivers/ddr/fsl/main.c
+++ b/drivers/ddr/fsl/main.c
@@ -786,7 +786,7 @@
 		print_size(total_memory, " of memory\n");
 		printf("       This U-Boot only supports < 4G of DDR\n");
 		printf("       You could rebuild it with CONFIG_PHYS_64BIT\n");
-		printf("       "); /* re-align to match init_func_ram print */
+		printf("       "); /* re-align to match init_dram print */
 		total_memory = CONFIG_MAX_MEM_MAPPED;
 	}
 #endif
@@ -796,7 +796,7 @@
 
 /*
  * fsl_ddr_sdram(void) -- this is the main function to be
- * called by initdram() in the board file.
+ * called by dram_init() in the board file.
  *
  * It returns amount of memory configured in bytes.
  */