global: Move remaining CONFIG_SYS_SDRAM_* to CFG_SYS_SDRAM_*

The rest of the unmigrated CONFIG symbols in the CONFIG_SYS_SDRAM
namespace do not easily transition to Kconfig. In many cases they likely
should come from the device tree instead. Move these out of CONFIG
namespace and in to CFG namespace.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/boot/image-board.c b/boot/image-board.c
index 34d1e5f..8813be5 100644
--- a/boot/image-board.c
+++ b/boot/image-board.c
@@ -116,8 +116,8 @@
 		return tmp;
 	}
 
-#if defined(CONFIG_SYS_SDRAM_BASE)
-	return CONFIG_SYS_SDRAM_BASE;
+#if defined(CFG_SYS_SDRAM_BASE)
+	return CFG_SYS_SDRAM_BASE;
 #elif defined(CONFIG_ARM) || defined(CONFIG_MICROBLAZE) || defined(CONFIG_RISCV)
 	return gd->bd->bi_dram[0].start;
 #else