The FIP flavor for OP-TEE + USB is managed in the meta-st-stm32mp layer through
the "optee-programmer-usb". However, since we do not require the additional
overhead introduced by the STM32CubeProgrammer tool, this commit introduces a
new FIP configuration based on OP-TEE for booting from USB.
https://onedigi.atlassian.net/browse/DEL-9442
Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>