vexpress: Build RTSM device-trees

This is a step to supporting Fast Models in the vexpress build.
As the booot partition of the vexpress image is getting rather cluttered
we will place all Fast Model related files in a 'rtsm' directory.

Change-Id: I04ce2f063b86e93bff97cc15d7cfe353c5636f70
Signed-off-by: Jon Medhurst <tixy@linaro.org>
1 file changed