feat(fvp): copy the Event Log to TZC secured DRAM area

Copied the Event Log from internal SRAM to the TZC secured DRAM
reserved area. Also passed this Trusted DRAM address to OPTEE via
NT FW configuration, and to SPMC via TOS FW configuration,
which is eventually used to extend PCR via fTPM application running
on top of OPTEE/SPMC.

Furthermore, this patch makes it easier to access Event Log in RME
enabled systems where Secure World firmware does not have access to
internal(Root) SRAM.

Change-Id: I005e9da1e6075511f412bdf4d8b541fa543df9ab
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>