ps2: Add a simple touchscreen model

Add a touchscreen model that is compatible with Linux's TouchKit
driver. This model is based on the model in the Arm PL050 KMI model.

Change-Id: Id4d88a21a26bb42c455e4d778cd89875f650ac57
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/9764
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
4 files changed