feat(tf-coverity): add USB target in STM32MP1 configs

Add a configuration for compilation for USB boot device, based on DFU.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Change-Id: I8426f1ae6df4cbcb1a0240b455f0b74b2f7fda5b
1 file changed