ARM: meson: enable USB DFU + RAM on Amlogic boards with USB Gadget

Enable DFU as an alternate USB boot method when script wasn't
uploaded, this fixes USB full boot on G12/SM1 boards.

Link: https://lore.kernel.org/r/20231023-usb-dfu-boot-v1-4-df9d121c67c1@linaro.org
[narmstrong: remove dfu from ad401]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
diff --git a/configs/sei510_defconfig b/configs/sei510_defconfig
index e3e1b15..c4a49fb 100644
--- a/configs/sei510_defconfig
+++ b/configs/sei510_defconfig
@@ -38,6 +38,7 @@
 CONFIG_CMD_ABOOTIMG=y
 # CONFIG_CMD_IMI is not set
 CONFIG_CMD_BCB=y
+CONFIG_CMD_DFU=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_GPT=y
 # CONFIG_CMD_LOADS is not set
@@ -53,6 +54,7 @@
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_SYS_MMC_ENV_DEV=2
 CONFIG_SYS_MMC_ENV_PART=1
+CONFIG_DFU_RAM=y
 CONFIG_USB_FUNCTION_FASTBOOT=y
 CONFIG_FASTBOOT_BUF_ADDR=0x6000000
 CONFIG_FASTBOOT_FLASH=y