warp7: defconfig: Enable CONFIG_BOOTM_TEE

warp7: defconfig: Enable CONFIG_BOOTM_TEE

This patch enables CONFIG_BOOTM_TEE. Once enabled its possible to
chain-load Linux through OPTEE.

Loading kernel to 0x80800000
=> run loadimage

Load FDT to 0x83000000
=> run loadfdt

Load OPTEE to 0x84000000
=> fatload mmc 0:5 0x84000000 /lib/firmware/uTee.optee

Then chain-load to the kernel via OPTEE

=> bootm 0x84000000 - 0x83000000

   Image Name:
   Image Type:   ARM Trusted Execution Environment Kernel Image (uncompressed)
   Data Size:    249844 Bytes = 244 KiB
   Load Address: 9dffffe4
   Entry Point:  9e000000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK

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>