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: NBryan O'Donoghue <bryan.odonoghue@linaro.org>
Tested-by: NBreno Lima <breno.lima@nxp.com>
Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>

configs/warp7_defconfig

@@ -47,3 +47,4 @@ CONFIG_USBNET_HOST_ADDR="de:ad:be:af:00:00"
 CONFIG_OF_LIBFDT=y
 CONFIG_OPTEE=y
 CONFIG_OPTEE_LOAD_ADDR=0x84000000
+CONFIG_BOOTM_OPTEE=y