[DEBUG] Add fake SMCCC TRNG support to QEMU & Trusty

This requires TRNG_SUPPORT=1 to build.
Change-Id: Ia99d1d9eee209fa1fcc9245176519e53ec492b90

Change-Id: Iefa5048f170c0354dbb4382f968db4d7ba9da96c
3 files changed