libsp: Unit testing the functions of sp_rxtx.c

Validating SP level RXTX buffer handler functions by checking them with
mocked FF-A layer implementation.

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: I2522857664f4fa2ecacb8a338f9a8257a6cca1f1
2 files changed