Integrate UEFI targets

[pedrolamarao]

Integrate UEFI targets with Psys test driver.

[pedrolamarao]

This is a summary of the problem.

UEFI relocates the application at load time.
Therefore, when we launch the debugger, it is necessary to relocate the debugging symbols.
Otherwise, setting break and watchpoints on symbols will set them on the wrong address.

UEFI provides a way to discover the application load address at runtime.
That requires breaking test execution at an appropriate point and then searching physical memory for a well known memory object, from which one can navigate pointers towards a certain object which describes the application load information.
The test driver must driver the emulator and/or the debugger to automate the discovery of this information.
This driver will be very different from the Multiboot2 driver, requiring the test architecture to acommodate two drivers.

[pedrolamarao]

Also, UEFI requires a FAT disk image.
See #129