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>

arch/nios2/cpu/cpu.c

@@ -73,7 +73,7 @@ static int nios_cpu_setup(void *ctx, struct event *event)
 	if (ret)
 		return ret;
 
-	gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
+	gd->ram_size = CFG_SYS_SDRAM_SIZE;
 #ifndef CONFIG_ROM_STUBS
 	copy_exception_trampoline();
 #endif