Device drivers ported from the Zircon kernel

zircon.lib.so
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The zircon.lib.so provides the interfacing between Genode and Zircon APIs.
It is meant to be extended if required and is required by any Zircon driver.

PS2
###

The zx_pc_ps2_drv can be used as a drop in replacement of the
ps2_drv. Its RAM resources needs to be increased to at least 2M.