Replace dts includes with C preprocessor syntax ...

Using the /include/ syntax, the include was evaluated by dtc, only after running
the preprocessor, therefore the .dtsi files were not preprocessed. This patch
adds the #include syntax instead. Evaluating this and preprocessing the files
now happens in a single step, done by the C preprocessor.

Change-Id: I6d0104b6274316fc736e84973502a4d6c2c9d6e0
Signed-off-by: Balint Dobszay <balint.dobszay@arm.com>

Add multithreaded DynamIQ dts file ...

The new dts file overrides the MPIDR values of the processing elements
which were defined in the common dtsi file. The new dts file defines
four cores in a single cluster, each core having two threads.

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: I0f8d8d250289077aee11eede4508871bb61dbc88