Merge changes from topic "mb/lfa-core-work" into integration

* changes:
docs(maintainers): add myself as code owner for LFA service
docs(lfa): update porting guide with LFA platform APIs
feat(

Merge changes from topic "mb/lfa-core-work" into integration

* changes:
docs(maintainers): add myself as code owner for LFA service
docs(lfa): update porting guide with LFA platform APIs
feat(lfa): add LFA holding pen logic
feat(lfa): add initial implementation for LFA_ACTIVATE
feat(lfa): add initial implementation for LFA_PRIME
feat(fvp): implement platform API for load and auth image
feat(lfa): implement LFA_CANCEL SMC
feat(fvp): implement platform API for LFA cancel operation
feat(lfa): implement LFA_GET_INVENTORY SMC
feat(fvp): implement platform API for LFA activation pending check
feat(lfa): implement LFA_GET_INFO SMC and integrate LFA build
feat(fvp): initialize LFA component activators in platform layer
feat(rmm): add placeholder activator callbacks for LFA
feat(bl31): add placeholder activator implementation for LFA
feat(lfa): add activation handler interface for component activation
feat(fvp): implement LFA get components API
feat(lfa): create LFA SMC handler template

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feat(bl31): add placeholder activator implementation for LFA

Introduce the BL31 component's activator structure with stub
implementations for the 'prime' and 'activate' callbacks.

Both callbacks cu

feat(bl31): add placeholder activator implementation for LFA

Introduce the BL31 component's activator structure with stub
implementations for the 'prime' and 'activate' callbacks.

Both callbacks currently return LFA_WRONG_STATE, indicating that
activation is not supported or allowed from BL31 in this context.

This activator is registered via get_bl31_activator(), allowing
the platform layer to wire it into the LFA framework.

Change-Id: I4279996b218d558a45cd99d5840f0e9f8ee97f90
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>

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