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/khadas-vim3_defconfig b/configs/khadas-vim3_defconfig
index 2340fbf..5df4b92 100644
--- a/configs/khadas-vim3_defconfig
+++ b/configs/khadas-vim3_defconfig
@@ -28,6 +28,7 @@
 CONFIG_SYS_MAXARGS=32
 # CONFIG_CMD_BDI is not set
 # CONFIG_CMD_IMI is not set
+CONFIG_CMD_DFU=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
 # CONFIG_CMD_LOADS is not set
@@ -45,6 +46,7 @@
 CONFIG_SARADC_MESON=y
 CONFIG_BUTTON=y
 CONFIG_BUTTON_ADC=y
+CONFIG_DFU_RAM=y
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MESON=y
 CONFIG_MMC_MESON_GX=y