Enable dispatcher to save/restore unbanked timer registers. So that
both secure (OP-TEE) and non-secure (Linux) worlds can have independent
access control over timer registers.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Change-Id: I4d58d5ff8298587ed478c8433fcbc3aef538d668

To make software license auditing simpler, use SPDX[0] license
identifiers instead of duplicating the license text in every file.

NOTE: Files that have been imported by FreeBSD have not been modified.

[0]: https://spdx.org/

Change-Id: I80a00e1f641b8cc075ca5a95b10607ed9ed8761a
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>

Adds a dispatcher for OP-TEE based on the test secure payload
dispatcher.

Fixes arm-software/tf-issues#239