pico-imx7d: Add bl33 config

Add default configuration to run u-boot as BL33 in the boot flow case
of ATF(ARM Trusted Firmware) -> OPTEE -> U-boot.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Fabio Estevam <festevam@gmail.com>

configs/pico-imx7d_bl33_defconfig

+CONFIG_ARM=y
+CONFIG_ARCH_MX7=y
+CONFIG_SYS_TEXT_BASE=0x87800000
+CONFIG_SPL_GPIO_SUPPORT=y
+CONFIG_SPL_LIBCOMMON_SUPPORT=y
+CONFIG_SPL_LIBGENERIC_SUPPORT=y
+CONFIG_TARGET_PICO_IMX7D=y
+CONFIG_SPL_MMC_SUPPORT=y
+CONFIG_SPL_SERIAL_SUPPORT=y
+CONFIG_SPL=y
+CONFIG_ARMV7_BOOT_SEC_DEFAULT=y
+CONFIG_FIT=y
+CONFIG_FIT_SIGNATURE=y
+CONFIG_FIT_VERBOSE=y
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"
+CONFIG_BOUNCE_BUFFER=y
+CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_USB_HOST_SUPPORT=y
+CONFIG_SPL_USB_GADGET=y
+CONFIG_SPL_USB_SDP_SUPPORT=y
+CONFIG_HUSH_PARSER=y
+# CONFIG_CMD_BOOTD is not set
+CONFIG_CMD_BOOTZ=y
+CONFIG_CMD_SPL=y
+CONFIG_CMD_SPL_WRITE_SIZE=0x20000
+CONFIG_CMD_MEMTEST=y
+CONFIG_CMD_DFU=y
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_GPT=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_USB=y
+CONFIG_CMD_USB_SDP=y
+CONFIG_CMD_USB_MASS_STORAGE=y
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_PXE=y
+CONFIG_CMD_CACHE=y
+CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
+CONFIG_OF_CONTROL=y
+CONFIG_DEFAULT_DEVICE_TREE="imx7d-pico-pi"
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_DFU_MMC=y
+CONFIG_DM_GPIO=y
+CONFIG_DM_MMC=y
+CONFIG_FSL_ESDHC=y
+CONFIG_PHYLIB=y
+CONFIG_MII=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_IMX7=y
+CONFIG_CONS_INDEX=4
+CONFIG_USB=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_MXC_USB_OTG_HACTIVE=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_MANUFACTURER="FSL"
+CONFIG_USB_GADGET_VENDOR_NUM=0x0525
+CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
+CONFIG_CI_UDC=y
+CONFIG_USB_GADGET_DOWNLOAD=y
+CONFIG_USB_ETHER=y
+CONFIG_USB_ETH_CDC=y
+CONFIG_USBNET_HOST_ADDR="de:ad:be:af:00:00"
+CONFIG_VIDEO=y
+CONFIG_OF_LIBFDT_OVERLAY=y
+CONFIG_OPTEE_TZDRAM_SIZE=0x2000000