Remove OP-TEE dependency of SP heap

Remove OPTEE_ prefix from OPTEE_SP_HEAP_SIZE definition and move it to
the CMake file of the deployment. This is a preparation for having
generic format SPs.

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: I73028dcbdf27a44285a1cd250cd242865bf6d119
19 files changed