Change in coreboot[master]: AGESA: Fix SMM support in ASEG

[Mike Banon (Code Review)]

Mike Banon has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/21624 )

Change subject: AGESA: Fix SMM support in ASEG
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Patch Set 5:

Currently there are some build problems like

ASUS_AM1I_A build FAILED after 7s!
Log excerpt:
src/cpu/amd/agesa/family16kb/model_16_init.c: In function 'model_16_init':
src/cpu/amd/agesa/family16kb/model_16_init.c:109:15: error: 'MSR_SMM_BASE' undeclared (first use in this function); did you mean 'SMM_BASE'?
   msr = rdmsr(MSR_SMM_BASE);
               ^~~~~~~~~~~~
               SMM_BASE
src/cpu/amd/agesa/family16kb/model_16_init.c:109:15: note: each undeclared identifier is reported only once for each function it appears in
src/cpu/amd/agesa/family16kb/model_16_init.c:114:15: error: 'MSR_SMM_MASK' undeclared (first use in this function); did you mean 'PS_STS_MASK'?
   msr = rdmsr(MSR_SMM_MASK);
               ^~~~~~~~~~~~
               PS_STS_MASK
make[1]: *** [Makefile:356: /cb-build/coreboot-gerrit.0/ASUS_AM1I_A/ramstage/cpu/amd/agesa/family16kb/model_16_init.o] Error 1
make[1]: Leaving directory '/home/coreboot/slave-root/workspace/coreboot-gerrit'