spl: Kconfig: Drop the _SUPPORT postfix from SPL_DFU

The symbol CONFIG_SPL_DFU_SUPPORT in SPL build has the same
meaning as CONFIG_DFU in regular U-Boot. Drop the _SUPPORT
to allow for cleaner use in code.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Lukasz Majewski <lukma@denx.de>
diff --git a/common/spl/spl_ram.c b/common/spl/spl_ram.c
index 5fcc3b1..954e91a 100644
--- a/common/spl/spl_ram.c
+++ b/common/spl/spl_ram.c
@@ -35,7 +35,7 @@
 
 	header = (struct image_header *)CONFIG_SPL_LOAD_FIT_ADDRESS;
 
-#if CONFIG_IS_ENABLED(DFU_SUPPORT)
+#if CONFIG_IS_ENABLED(DFU)
 	if (bootdev->boot_device == BOOT_DEVICE_DFU)
 		spl_dfu_cmd(0, "dfu_alt_info_ram", "ram", "0");
 #endif
@@ -76,7 +76,7 @@
 #if CONFIG_IS_ENABLED(RAM_DEVICE)
 SPL_LOAD_IMAGE_METHOD("RAM", 0, BOOT_DEVICE_RAM, spl_ram_load_image);
 #endif
-#if CONFIG_IS_ENABLED(DFU_SUPPORT)
+#if CONFIG_IS_ENABLED(DFU)
 SPL_LOAD_IMAGE_METHOD("DFU", 0, BOOT_DEVICE_DFU, spl_ram_load_image);
 #endif