Drop CONFIG_SPL_RAM_SUPPORT

This option does not exist in U-Boot. Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/rk3288_common.h b/include/configs/rk3288_common.h
index 601186c..49f35a6 100644
--- a/include/configs/rk3288_common.h
+++ b/include/configs/rk3288_common.h
@@ -67,7 +67,6 @@
 #define CONFIG_SPL_FS_LOAD_PAYLOAD_NAME		"u-boot.img"
 
 #define CONFIG_SPL_PINCTRL_SUPPORT
-#define CONFIG_SPL_RAM_SUPPORT
 #define CONFIG_SPL_DRIVERS_MISC_SUPPORT
 
 #define CONFIG_SYS_SDRAM_BASE		0