cmake: product/synquacer

This change adds CMake build support for product/synquacer

Please note that firmware targets do not use libRTX_CM3.a
or RTX_CM3.lib, instead in CMake build, the library
is built using sources.

Change-Id: I886dd947c8d84d4ffb4d0a0f4c84defd4224d48b
Signed-off-by: Girish Pathak <girish.pathak@arm.com>