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/arch/powerpc/cpu/mpc85xx/cpu.c b/arch/powerpc/cpu/mpc85xx/cpu.c
index 64e0aa7..e3ef4ae 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu.c
@@ -401,7 +401,7 @@
 #ifndef CONFIG_FSL_CORENET
 #if (defined(CONFIG_SYS_RAMBOOT) || defined(CONFIG_SPL)) && \
 	!defined(CONFIG_SYS_INIT_L2_ADDR)
-int initdram(void)
+int dram_init(void)
 {
 #if defined(CONFIG_SPD_EEPROM) || defined(CONFIG_DDR_SPD) || \
 	defined(CONFIG_ARCH_QEMU_E500)
@@ -413,7 +413,7 @@
 	return 0;
 }
 #else /* CONFIG_SYS_RAMBOOT */
-int initdram(void)
+int dram_init(void)
 {
 	phys_size_t dram_size = 0;