Merge changes from topic "qemu_sbsa" into integration

* changes:
qemu: Simplify the image size calculation
qemu: introducing sub-platforms to qemu platform

qemu: introducing sub-platforms to qemu platform

This commit change the plat/qemu directory structure into:

`-- plat
`-- qemu
|-- common (files shared with all qemu subplatforms)

qemu: introducing sub-platforms to qemu platform

This commit change the plat/qemu directory structure into:

`-- plat
`-- qemu
|-- common (files shared with all qemu subplatforms)
|-- qemu (original qemu platform)
|-- qemu_sbsa (new sqemu_sbsa platform)
|-- subplat1
`-- subplat2

This opens the possibility of adding new qemu sub-platforms which reuse
existing common platform code. The first platform which will leverage new
structure will be SBSA platform.

Signed-off-by: Radoslaw Biernacki <radoslaw.biernacki@linaro.org>
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Change-Id: Id0d8133e1fffc1b574b69aa2770ebc02bb837a9b

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