shruti gupta

fix(el3-spmc): add datastore linker script markers

feat(rmm): update RMI VERSION command as per EAC5

fix(tsp): use verbose for power logs

fix(el3-spmc): fix coverity scan warnings

fix(el3-spmc): improve bound check for descriptor

docs(rme): add instruction to build rmm

docs(spm): add threat model for el3 spmc

docs(spm): add design documentation