Support generic-timer (and EL2) on Armv7-A#141
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Requires we change the emulated CPU from Cortex-A8 to Cortex-A15, as Cortex-A8 doesn't have the timer extensions. That in turn meant we booted into EL2, so we needed to bounce ourselves into EL1 that the examples were expecting. And that meant making a bunch of Hyp registers available on Armv7-A and Armv8-R, and changing the Armv7-A start-up routine to be the Armv8-R routine.
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Fixes #140 by adding generic timer support for Armv7-A.
registers::armv8rmodule and into a newregisters::hypmodule available on Armv7-A and Armv8-R