warp7: defconfig: Enable OPTEE for WaRP7

Requires setting CONFIG_OPTEE=y and setting an OPTEE TrustZone DRAM base in
include/configs/warp7.h.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Tested-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

configs/warp7_defconfig

@@ -44,3 +44,4 @@ CONFIG_USB_ETHER=y
 CONFIG_USB_ETH_CDC=y
 CONFIG_USBNET_HOST_ADDR="de:ad:be:af:00:00"
 CONFIG_OF_LIBFDT=y
+CONFIG_OPTEE=y