feat(tf-coverity): update STM32MP1 configs

Split compilations for each possible boot device.
Add a configuration for stm32image boot (non-FIP).
Remove bl1 compilation that is not used on STM32MP1.

Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Change-Id: I44bef476bfb1f3a5513af712948ff700faab442f
1 file changed