Merge changes from topic "mp/ffa_v1_1_eac"
* changes:
fix: serialize powering on secondary CPUs
fix(interrupts): deny new direct request message from endpoint
test(interrupts): command to resume after managed exit
test(interrupts): hint fwd destination SP could be interrupted
fix(interrupts): dont enable virtual maintenance interrupts
test(interrupts): managed exit supported by second SP
test(interrupts): managed exit supported by first SP
test(interrupts): exercise managed exit by two SPs in a call chain
test(interrupts): exercise ns interrupt being queued
test(interrupts): exercise ns interrupt being signaled to SP
feat(interrupts): resume interrupted target vCPU
feat(interrupts): add support for handling managed exit through vIRQ
feat(interrupts): discover interrupt ID of managed exit signal
feat(interrupts): specify action in response to ns interrupt in manifest
fix(direct message request): incorrect response for illegal transition