Boot: remove heap usage from BL2

Mbedtls is initialised with a static memory buffer to
allocate dynamic memory from this buffer rather than
using the heap.

Change-Id: I1369948b2b8ecf78db4bdd4cd2051d1f32d61e7f
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
9 files changed