feat(lfa): implement LFA_GET_INFO SMC and integrate LFA build

Implement the LFA_GET_INFO SMC handler, which retrieves the
number of supported firmware components and performs initial
setup via the platform APIs. This forms the entry point for
LFA usage and makes component metadata available for later use.

Update the build system to include LFA sources.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I4016615a88706972eff6ea5777dda6d5a3a04074
3 files changed