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/board/imgtec/boston/ddr.c b/board/imgtec/boston/ddr.c
index b92ff2a..3479b98 100644
--- a/board/imgtec/boston/ddr.c
+++ b/board/imgtec/boston/ddr.c
@@ -12,7 +12,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-int initdram(void)
+int dram_init(void)
 {
 	u32 ddrconf0 = __raw_readl((uint32_t *)BOSTON_PLAT_DDRCONF0);
 
diff --git a/board/imgtec/malta/malta.c b/board/imgtec/malta/malta.c
index f8c65b0..de81aa0 100644
--- a/board/imgtec/malta/malta.c
+++ b/board/imgtec/malta/malta.c
@@ -85,7 +85,7 @@
 	}
 }
 
-int initdram(void)
+int dram_init(void)
 {
 	gd->ram_size = CONFIG_SYS_MEM_SIZE;
 
diff --git a/board/imgtec/xilfpga/xilfpga.c b/board/imgtec/xilfpga/xilfpga.c
index 8aa7c10..841d614 100644
--- a/board/imgtec/xilfpga/xilfpga.c
+++ b/board/imgtec/xilfpga/xilfpga.c
@@ -14,7 +14,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 /* initialize the DDR Controller and PHY */
-int initdram(void)
+int dram_init(void)
 {
 	/* MIG IP block is smart and doesn't need SW
 	 * to do any init */