pc-bios/optionrom: Drop -fcf-protection

Earlier this year, Ubuntu gcc packages turned on -fcf-protection
which causes build failures for the optionrom code likely because
it builds with -march=i486 and -fcf-protection is only supported
for i686 targets or newer.

Test: checkout and build trusty with GCC 11.2.0 or newer.
Bug: None
Change-Id: I735ab4b5d840254968217bfe016b9d52f483536f
1 file changed