[coreboot] Asan/Ubsan for further testing

[Shawn C]

Hi,

coreboot have two types of sanitizers already: Ubsan and Asan. This is good starting point. I found a few catches by simply enabling CONFIG_COVERAGE, CONFIG_UBSAN and CONFIG_ASAN:
https://ticket.coreboot.org/issues/288

The developer seems haven't enable them in the testing process yet. It would be better if we add those debug features by default during the development which could possibly kill more bugs in the coreboot and the sanitizers themselves. Any ideas?

regards
Shawn C