topic_miami(plus) defconfig: Enable DFU RAM support

Allow sending firmware to RAM. Without this, the DFU support was not
of much use.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/topic_miami_defconfig b/configs/topic_miami_defconfig
index 7eb1008..fc0120e 100644
--- a/configs/topic_miami_defconfig
+++ b/configs/topic_miami_defconfig
@@ -28,6 +28,7 @@
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_OF_EMBED=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
+CONFIG_DFU_RAM=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_ZYNQ=y
 CONFIG_SPI_FLASH=y