bootm: optee: Add a bootm command for type IH_OS_TEE

bootm: optee: Add a bootm command for type IH_OS_TEE

This patch makes it possible to verify the contents and location of an
OPTEE image in DRAM prior to handing off control to that image. If image
verification fails we won't try to boot any further.

Signed-off-by: Bryan O'Donoghue <[email protected]>
Suggested-by: Andrew F. Davis <[email protected]>
Cc: Harinarayan Bhatta <[email protected]>
Cc: Andrew F. Davis <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Kever Yang <[email protected]>
Cc: Philipp Tomsich <[email protected]>
Cc: Peng Fan <[email protected]>