Add log provider component

Add component for handling logging RPC calls from SPs.

Signed-off-by: Gabor Toth <gabor.toth2@arm.com>
Signed-off-by: Gabor Ambrus <gabor.ambrus@arm.com>
Change-Id: I6d09bac2c77eaff1356e2d8f0d0883aa7803b998
8 files changed