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Change-Id: I679d1499376a524bef1cfc33df995b0a719b5ac8
Signed-off-by: Paul Beesley <paul.beesley@arm.com>

   - Redraw the interrupt diagrams with dia tool
   - Change TSP_HANDLED_S_EL1_FIQ to TSP_HANDLED_S_EL1_INTR in sec-int-handling.png
   - Use the makefile generate the image to avoid unnessary generate
   - Add dia source code

Change-Id: I016022ca964720e8497c27c88a3f371459abc284
Signed-off-by: Qixiang Xu <qixiang.xu@arm.com>

This patch adds documentation that describes the design of the Interrupt
management framework in the ARM Trusted Firmware. The porting-guide.md has also
been updated to describe the interface that should be implemented by each
platform to support this framework.

Change-Id: I3eda48e5c9456e6a9516956bee16a29e366633b7
Co-Authored-By: Soby Mathew <soby.mathew@arm.com>