Add common service component to ipc support

Add support for inter processor communication for PSA
including, the openamp client side structures lib, and
a rpc caller interface.

Signed-off-by: Vishnu Banavath <vishnu.banavath@arm.com>
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Change-Id: I889fdc627989a95d726535f4c6820744392ed881
7 files changed